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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Operating Segments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AmountReceivableUponAchievementOfRegulatoryAndCommercialMilestones_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amount Receivable Upon Achievement Of Regulatory And Commercial Milestones</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AmountReceivableUponAchievementOfRegulatoryAndCommercialMilestones_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount receivable upon achievement of regulatory and commercial milestones.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AmountReceivableUponAchievementOfRegulatoryAndCommercialMilestones_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount receivable upon achievement of regulatory and commercial milestones</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Acquisition of ZebiAI</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price Per Share, Vested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance, shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance, shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares, Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Hierarchy and NAV</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Net Assets Acquired Based on Estimated Fair Values</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardRsusReleasedInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares, released</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardRsusReleasedInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share based compensation arrangement by share based payment award RSUs released in period gross.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardRsusReleasedInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share based compensation arrangement by share based payment award RSUs released in period gross.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 2 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 2 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share Based Compensation Arrangement By Share Based Payment Award [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLossMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Income (Loss) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLossMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Income (Loss) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentAffiliatedIssuerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investment, Affiliated Issuer [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentAffiliatedIssuerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Affiliated Issuer [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CowenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cowen [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CowenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cowen.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments, Fair Value Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Consideration Transferred, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Consideration transferred</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Consideration Transferred</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfSharesWouldBeIssuedUponMilestoneAchievements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares that would be issued upon milestone achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfSharesWouldBeIssuedUponMilestoneAchievements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Shares Would Be Issued Upon Milestone Achievements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfSharesWouldBeIssuedUponMilestoneAchievements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of Shares Would Be Issued Upon Milestone Achievements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockInInitialPublicOfferingNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Issuance of common stock in initial public offering, net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockInInitialPublicOfferingNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issuance of common stock in initial public offering, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockInInitialPublicOfferingNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock in initial public offering/follow-on offering, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Investments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Investments, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Investments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Investments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PropertyAndEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property and Equipment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PropertyAndEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Property and Equipment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExaminationDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Description of income tax examinations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExaminationDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Examination, Description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Leases [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and Contingencies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TDSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">T D Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TDSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">TD securities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TDSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">TD Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StockIssuedDuringPeriodValueAcquisitionNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stock issued during period value acquisition new issues.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StockIssuedDuringPeriodValueAcquisitionNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period Value Acquisition New Issues</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StockIssuedDuringPeriodValueAcquisitionNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock in follow-on offering, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product and Service</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommonStockIssuedUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Common stock issued upon milestone achievement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommonStockIssuedUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common stock issued upon milestone achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Intangible asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Indefinite-Lived Intangible Assets (Excluding Goodwill)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Indefinite-Lived Intangible Assets (Excluding Goodwill), Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Indefinite-Lived Intangible Assets (Excluding Goodwill), Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Indefinite-Lived Intangible Assets (Excluding Goodwill), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Milestone Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Milestone payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommitmentsAndContingenciesDisclosureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments And Contingencies Disclosure [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommitmentsAndContingenciesDisclosureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments And Contingencies Disclosure [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommitmentsAndContingenciesDisclosureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commitments and contingencies disclosure.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaborative Arrangement and Arrangement Other than Collaborative</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TimeBasedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Time-Based Stock Options [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TimeBasedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Time-based stock options.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesIntegratedTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes Integrated [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease Liabilities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Operating lease liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ScheduleOfOperatingLeasePresentationInConsolidatedBalanceSheetTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Operating Leases Presentation in Consolidated Balance Sheets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ScheduleOfOperatingLeasePresentationInConsolidatedBalanceSheetTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Operating Lease Presentation In Consolidated Balance Sheet Table [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ScheduleOfOperatingLeasePresentationInConsolidatedBalanceSheetTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of operating lease presentation in consolidated balance sheet.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PeriodicChangeInAdditionsOfPropertyAndEquipmentWithinCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Periodic Change in Additions of Property And Equipment Within Current Liabilities</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PeriodicChangeInAdditionsOfPropertyAndEquipmentWithinCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Periodic change in additions of property and equipment within current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and Cash Equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievementForEachTargetThereafter_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone payment due for each target thereafter</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Central Index Key</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary Of The Restricted Stock Activity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActDescriptionOfCorporateTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act description of corporate tax payers.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActDescriptionOfCorporateTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act Description Of Corporate Tax Payers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActDescriptionOfCorporateTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act, description of corporate tax payers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PercentageOfCommissionOwedToSalesAgentUnderAtTheMarketOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of commission owed to sales agent under at-the-market offering.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PercentageOfCommissionOwedToSalesAgentUnderAtTheMarketOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of commission owed to sales agent under at-the-market offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PercentageOfCommissionOwedToSalesAgentUnderAtTheMarketOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of commission owed to sales agent under at-the-market offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PeriodicChangeInCostsToObtainLicenseAgreementWithinCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Periodic Change in Costs to Obtain License Agreement Within Current Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PeriodicChangeInCostsToObtainLicenseAgreementWithinCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Periodic change in costs to obtain license agreement within current liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PeriodicChangeInCostsToObtainLicenseAgreementWithinCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Periodic change in costs to obtain license agreement within current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of shares, cancelled</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Cancelled, Number of Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorOpinionTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Opinion [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes in assets and liabilities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Operating Capital [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ChangeInFairValueOfContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of increase (decrease) in the fair value of contingent consideration recognized in the income statement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ChangeInFairValueOfContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in fair value of contingent consideration liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ChangeInFairValueOfContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in fair value of contingent consideration liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_UnderwritingDiscountsCommissionsAndOtherOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Underwriting discounts, commissions and other offering expenses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_UnderwritingDiscountsCommissionsAndOtherOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriting Discounts, Commissions And Other Offering Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_UnderwritingDiscountsCommissionsAndOtherOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriting discounts, commissions and other offering expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPerecentageOfTaxableIncomeLimitation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act, percentage of eliminates of taxable income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPerecentageOfTaxableIncomeLimitation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">CARES Act Perecentage Of Taxable Income Limitation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPerecentageOfTaxableIncomeLimitation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act perecentage of taxable income limitation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Common Stock, Shares, Issued, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_InvestmentsWithMaturityOfOneYearOrLessMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments with a maturity of one year or less [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_InvestmentsWithMaturityOfOneYearOrLessMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments With Maturity Of One Year Or Less [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_InvestmentsWithMaturityOfOneYearOrLessMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Investments with maturity of one year or less.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfBonusDepreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act, percentage of bonus depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfBonusDepreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act Percentage Of Bonus Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfBonusDepreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act, percentage of bonus depreciation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Risk-free interest rate minimum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nature of Business and Basis of Presentation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Description and Basis of Presentation [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, State or Province</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock via employee stock purchase plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Employee Stock Purchase Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">After-tax contributions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Current Assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current Assets [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Assets [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares authorized additionally under ESPP</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AmountReceivableInAchievementOfRegulatoryAndCommercialMilestones_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amount Receivable in Achievement of Regulatory and Commercial Milestones</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AmountReceivableInAchievementOfRegulatoryAndCommercialMilestones_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount Receivable in Achievement of Regulatory and Commercial Milestones</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AmountReceivableInAchievementOfRegulatoryAndCommercialMilestones_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount receivable in achievement of regulatory and commercial milestones</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate Intrinsic Value, Vested Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business combination contingent consideration liability contingent milestone payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination contingent consideration liability contingent milestone payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone payment Due</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Milestone Payment Due Upon Specified Regulatory Milestone Achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Milestone payment due upon specified regulatory milestone achievement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cover [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Comprehensive Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net loss per share, basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings Per Share, Basic, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net loss attributable to common stockholders per share, basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentsCompletionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone payments completion period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentsCompletionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Milestone Payments Completion Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentsCompletionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Milestone payments completion period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedCompensationCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accrued compensation costs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedCompensationCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Compensation Costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedCompensationCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Compensation costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Contract with Customer, Asset, after Allowance for Credit Loss, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contract asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Asset, after Allowance for Credit Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentForUpfrontConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payment for upfront consideration.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentForUpfrontConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment For Upfront Consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentForUpfrontConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment for upfront consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ProceedsFromIssuanceOfCommonStockThroughExerciseOfStockOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds From Issuance Of Common Stock Through Exercise Of Stock Options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ProceedsFromIssuanceOfCommonStockThroughExerciseOfStockOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proceeds from issuance of common stock through exercise of stock options.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ProceedsFromIssuanceOfCommonStockThroughExerciseOfStockOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from issuance of common stock through exercise of stock options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrealized Gains</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating expenses:</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock upon acquisition of ZebiAI, shares</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Milestone Payments [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Milestone payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementContractToPerformForOthersRenewalPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Agreement renewal period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementContractToPerformForOthersRenewalPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research And Development Arrangement Contract To Perform For Others Renewal Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementContractToPerformForOthersRenewalPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Research and development arrangement contract to perform for others renewal period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Annual Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ConsolidationItemsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Consolidation Items [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewGeneticDiseasePrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of New Genetic Disease Programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewGeneticDiseasePrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of new genetic disease programs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewGeneticDiseasePrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of genetic disease programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TransferOfActivePharmaceuticalIngredientMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transfer of Active Pharmaceutical Ingredient [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TransferOfActivePharmaceuticalIngredientMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Transfer Of Active Pharmaceutical Ingredient.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TransferOfActivePharmaceuticalIngredientMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transfer of Active Pharmaceutical Ingredient [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Stock-based compensation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total share-based compensation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockInInitialPublicOfferingShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Issuance of common stock in initial public offering shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockInInitialPublicOfferingShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issuance of Common Stock in Initial Public Offering Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockInInitialPublicOfferingShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock in initial public offering/follow-on offering, net, Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax assets:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Net [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Retained Earnings (Accumulated Deficit), Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Retained Earnings (Accumulated Deficit), Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Retained Earnings (Accumulated Deficit), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated deficit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings (Accumulated Deficit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accumulated deficit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plan Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plan Name [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Options and Warrants Outstanding, Number of Shares Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Options and Warrants Outstanding, Number of Shares Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current assets:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxLiabilitiesOperatingLeaseAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Operating lease assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxLiabilitiesOperatingLeaseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Liabilities Operating Lease Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxLiabilitiesOperatingLeaseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax liabilities operating lease assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExpensesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accrued expenses text block.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExpensesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Expenses [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExpensesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TransferOfLicenseAndRelatedKnowHowMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Transfer of License and Related Know-how.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TransferOfLicenseAndRelatedKnowHowMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transfer of License and Related Know-How [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash used in operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Operating Activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Grant Date Fair Value, Cancelled</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product and Service</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Accumulated Other Comprehensive Income (Loss), Net of Tax, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Other Comprehensive Income (Loss), Net of Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated other comprehensive loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accumulated other comprehensive loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Term of the lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Term of Contract</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_InvestmentsWithMaturityOfOneToTwoYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments with a maturity of one to two years [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_InvestmentsWithMaturityOfOneToTwoYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments With Maturity Of One To Two Years [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_InvestmentsWithMaturityOfOneToTwoYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Investments with maturity of one to two years.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasedAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Leased Assets [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasedAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Leased Assets [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Property, Plant and Equipment, Net, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Property, Plant and Equipment, Net, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total property and equipment, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and equipment, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2028</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash flows from operating activities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value on a recurring basis [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Recurring [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Income and Expenses [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other income:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis and Level of the Fair Value Hierarchy</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TaxCutsAndJobsActOf2017DescriptionOfCorporateTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax Cuts and Jobs Act of 2017, description of corporate tax payers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TaxCutsAndJobsActOf2017DescriptionOfCorporateTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax Cuts And Jobs Act Of2017 Description Of Corporate Tax Payers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TaxCutsAndJobsActOf2017DescriptionOfCorporateTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tax Cuts and Jobs Act of 2017, description of corporate tax payers.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock par value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Par or Stated Value Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Options outstanding to purchase common stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementPositionsOrCommitteesResponsibleTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Positions or Committees Responsible [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_VestingOfRestrictedCommonStockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vesting of restricted common stock ,shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_VestingOfRestrictedCommonStockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Vesting Of Restricted Common Stock Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_VestingOfRestrictedCommonStockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Vesting of restricted common stock shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Cash Flows [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CounterpartyNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Counterparty Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CounterpartyNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Counterparty Name [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Antidilutive Securities, Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Intangibles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Goodwill and Intangible Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Components</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Components [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationsAgreementTransactionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement transaction price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationsAgreementTransactionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborations agreement transaction price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationsAgreementTransactionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Collaborations agreement transaction price.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_SharebasedCompensationsArrangementByShareBasedPaymentsAwardOptionsNonVestedIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sharebased Compensations Arrangement by Share Based Payments Award Options Non Vested Intrinsic Value 1</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_SharebasedCompensationsArrangementByShareBasedPaymentsAwardOptionsNonVestedIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sharebased compensations arrangement by share based payments award options non vested intrinsic value.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_SharebasedCompensationsArrangementByShareBasedPaymentsAwardOptionsNonVestedIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate Intrinsic Value, Unvested Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Computation of Basic and Diluted Net Loss Per Share</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of Shares Underlying RSUs, Granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskProcessForInformingBoardCommitteeOrSubcommitteeResponsibleForOversightTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComputerEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Computer Equipment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComputerEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Computer Equipment [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Expense [Abstract]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Antidilutive Securities Excluded From Computation of Earnings Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Risk-free interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfCommonStockIssuedUponMilestoneAchievements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of common stock issued upon milestone achievements.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfCommonStockIssuedUponMilestoneAchievements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Common Stock Issued Upon Milestone Achievements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfCommonStockIssuedUponMilestoneAchievements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of common stock issued upon milestone achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PatentCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Patent Costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PatentCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Patent Costs Policy [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PatentCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Patent costs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Shares - Beginning</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Shares - Ending</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">R&amp;D credit carryovers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Voluntary Filers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BmrHampshireLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">BMR Hampshire, LLC [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BmrHampshireLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">BMR-Hampshire, LLC. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BmrHampshireLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">BMR-Hampshire, LLC. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncreaseDecreaseInOperatingLeaseAssetsAndLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Operating lease assets and liabilities, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncreaseDecreaseInOperatingLeaseAssetsAndLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase decrease in operating lease assets and liabilities net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncreaseDecreaseInOperatingLeaseAssetsAndLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase decrease in operating lease assets and liabilities net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amendment Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DirectorsAndOfficersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Directors and Officers.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DirectorsAndOfficersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Directors and Officers [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StockIssuedDuringPeriodAdditionalSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StockIssuedDuringPeriodAdditionalSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock issued during period additional shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StockIssuedDuringPeriodAdditionalSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stock issued during period additional shares issued.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DEShawResearchMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">DE Shaw Research [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DEShawResearchMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">D E Shaw Research [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DEShawResearchMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">DE shaw research.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditsOrphanDrugBeginToExpireYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Orphan drug tax credits, begin to expire year</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditsOrphanDrugBeginToExpireYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets tax credits orphan drug begin to expire year.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Non-current operating lease liabilities</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockConsiderationReceivedPerTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate gross proceeds from the sale of shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockConsiderationReceivedPerTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock, Consideration Received Per Transaction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Domestic Tax Jurisdiction [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TextBlockAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Text Block [Abstract]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Offering price per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock, Price Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of shares exercised</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development expenses [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Research and Development Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PercentageOfAdditionalCommonStockAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of additional common stock authorized</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_FollowOnOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Follow on offering.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_FollowOnOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Follow-On Offering [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ElevarTherapeuticsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Elevar Therapeutics, Inc.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statistical Measurement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ContractWithCustomerCashReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash received up on conditions satisfied</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ContractWithCustomerCashReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract With Customer Cash Received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ContractWithCustomerCashReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contract with customer cash received.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFinStmtErrorCorrectionFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Financial Statement Error Correction [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">General and Administrative Expense, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">General and administrative expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">General and Administrative Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Proceeds from Sale of Property, Plant, and Equipment, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from sale of equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Sale of Property, Plant, and Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other income, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Nonoperating Income (Expense)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskMateriallyAffectedOrReasonablyLikelyToMateriallyAffectRegistrantTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FurnitureAndFixturesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Furniture and Fixtures [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FurnitureAndFixturesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Furniture and Fixtures [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LicenseAndTransferAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transfer of License [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LicenseAndTransferAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">License And Transfer Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LicenseAndTransferAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">License and transfer agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesIntegratedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes Integrated [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExaminationLikelihoodOfUnfavorableSettlement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Description of Income tax benefit, likelihood of realized upon ultimate settlement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExaminationLikelihoodOfUnfavorableSettlement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Examination, Likelihood of Unfavorable Settlement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredRevenueCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredRevenueCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Revenue, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredRevenueCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred Revenue, Current, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Preferred Stock, Shares Issued, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Fixed lease payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Retirement Benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retirement Benefits [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination, contingent milestone payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Milestone Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Milestone Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares, Unvested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PayablesAndAccrualsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payables and Accruals [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Rly2139AndEstrogenReceptorAlphaDegraderMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">RLY-2139 and Estrogen Receptor Alpha Degrader [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Rly2139AndEstrogenReceptorAlphaDegraderMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">RLY-2139 and Estrogen Receptor Alpha Degrader [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Rly2139AndEstrogenReceptorAlphaDegraderMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">RLY-2139 and Estrogen Receptor Alpha Degrader [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Rule10B5ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Rule 10b5 Arr Modified Flag.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Rule10B5ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Rule 10b 5 Arr Modified Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Rule10B5ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Rule 10b5-1 Arrangement Modified</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewNovelPrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of New Novel Programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewNovelPrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of New Novel Programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewNovelPrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of novel programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock via employee stock purchase plan, shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Employee Stock Purchase Plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Shares of common stock purchased</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ConsolidationItemsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Consolidation Items [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Risk-free interest rate maximum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesByIndustryAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Industry Sector [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price Per Share, Cancelled</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Cash, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfArrangementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaborative Arrangement and Arrangement Other than Collaborative</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfArrangementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payments to be received upon achievement of other specified development commercialization and sales based milestones does not exercise option to participate in collaboration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments To Be Received Upon Achievement Of Other Specified Development Commercialization And Sales Based Milestones Does Not Exercise Option To Participate In Collaboration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payments to be received upon achievement of other specified development commercialization and sales based milestones does not exercise option To participate in collaboration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Net of Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other comprehensive (loss) income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditsResearchAndDevelopmentBeginToExpireYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets Tax Credits Research and Development Begin to Expire Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditsResearchAndDevelopmentBeginToExpireYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets tax credits research and development begin to expire year.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditsResearchAndDevelopmentBeginToExpireYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development tax credits, begin to expire year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration and License Agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total comprehensive loss</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Common Stock, Shares, Outstanding, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Common Stock, Shares, Outstanding, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ScheduleOfChangesInFairValueOfContingentConsiderationLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Changes In Fair Value Of Contingent Consideration Liability [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ScheduleOfChangesInFairValueOfContingentConsiderationLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of changes in fair value of contingent consideration liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ScheduleOfChangesInFairValueOfContingentConsiderationLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Changes in Contingent Consideration Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments to Acquire Investments, Total</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LicenseAgreementTransactionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">License Agreement Transaction Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LicenseAgreementTransactionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">License agreement aransaction price.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LicenseAgreementTransactionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">License agreement transaction price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Measurements</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Interactive Data Current</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Cash, cash equivalents, and restricted cash per statements of cash flows</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LicenseAgreementTermsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">License Agreement Terms [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of RSUs, cancelled</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Number of Shares Underlying RSUs, Cancelled</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cancelled</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BinneyStreetCambridgeMassachusettsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">399 Binney Street [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BinneyStreetCambridgeMassachusettsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">399 Binney Street, Cambridge, Massachusetts.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BinneyStreetCambridgeMassachusettsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Binney Street, Cambridge, Massachusetts [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Cost by Plan [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Total Stock Compensation Expense Recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Depreciation, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_RestrictedCashAndCashEquivalentsAtCarryingValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Cash And Cash Equivalents At Carrying Value [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_RestrictedCashAndCashEquivalentsAtCarryingValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Restricted cash and cash equivalents at carrying value abstract.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grant date share price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of shares, vested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Segment Reporting Information, by Segment [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Liabilities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Current liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskThirdPartyOversightAndIdentificationProcessesFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrivatePlacementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Private Placement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrivatePlacementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock Compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementPositionsOrCommitteesResponsibleReportToBoardFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Construction in Process [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Construction in Progress [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_SignificantAccountingPoliciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Significant Accounting Policies [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_SignificantAccountingPoliciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_SignificantAccountingPoliciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Significant accounting policies.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share-based Payment Award, Number of Shares Authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommonStockSharesIssuedUponConversion_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Common stock shares issued upon conversion.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommonStockSharesIssuedUponConversion_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common stock shares issued upon conversion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommonStockSharesIssuedUponConversion_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding convertible preferred stock converted into common shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesAPreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Series A Preferred Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesAPreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Series A Preferred Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average discount rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Weighted Average Discount Rate, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Disclosures [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndManufacturingContractsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and Manufacturing Contracts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndManufacturingContractsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research And Manufacturing Contracts Policy [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndManufacturingContractsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Research and manufacturing contracts.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherSegmentExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other segment expenses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherSegmentExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Segment Expenses [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherSegmentExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other segment expenses (income)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Public Float</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfCorporateCharitableDeductionLimit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act, percentage of corporate charitable deduction limit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfCorporateCharitableDeductionLimit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act Percentage Of Corporate Charitable Deduction Limit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfCorporateCharitableDeductionLimit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act, percentage of corporate charitable deduction limit.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, New Issues</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Net of Valuation Allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock through exercise of stock options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Stock Options Exercised</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current liabilities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfSharesGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Shares Granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfSharesGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of shares granted.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfSharesGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonfinancialLiabilitiesFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonfinancialLiabilitiesFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonfinancial Liabilities Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfDiscoveryStagePrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of discovery stage programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfDiscoveryStagePrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of discovery stage programs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USGovernmentAgenciesDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">U.S agency securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USGovernmentAgenciesDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">US Government Agencies Debt Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USGovernmentAgenciesDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">U.S. agency securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Issuance of common stock upon milestone achievement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issuance of common stock upon milestone achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IssuanceOfCommonStockUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock upon milestone achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_WeightedAverageNumberOfSharesOutstandingDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Weighted average number of shares outstanding diluted.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_WeightedAverageNumberOfSharesOutstandingDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number Of Shares Outstanding Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_WeightedAverageNumberOfSharesOutstandingDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average shares of common stock, diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of 12(b) Security</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Cash and Cash Equivalents, at Carrying Value, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Cash and Cash Equivalents, at Carrying Value, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Cash and Cash Equivalents, at Carrying Value, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, at Carrying Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedWeightedAverageRemainingContractualTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Remaining Contractual Life, Unvested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedWeightedAverageRemainingContractualTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Weighted Average Remaining Contractual Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedWeightedAverageRemainingContractualTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share based compensation arrangement by share based payment award options non vested weighted average remaining contractual term.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Financial Position Location, Balance [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2029</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Stockholders' Equity [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActNetOperatingLossesCarryBackPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryback period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActNetOperatingLossesCarryBackPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act net operating losses carry back period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActNetOperatingLossesCarryBackPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act net operating losses carry back period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Period Focus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total intrinsic value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Research and Development Expense, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Research and development expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Granted, Number of Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of stock options granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Effective Date of Acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset Class [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Property, Plant and Equipment, Gross, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Property, Plant and Equipment, Gross, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Property, Plant and Equipment, Gross, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementAnnualFee_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development arrangement, annual fee</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementAnnualFee_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research And Development Arrangement Annual Fee</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementAnnualFee_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Research and development arrangement, annual fee.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ElevarAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Elevar Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ElevarAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Elevar agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CashAndCashEquivalentsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash And Cash Equivalents Fair Value Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CashAndCashEquivalentsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash equivalents:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CashAndCashEquivalentsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash and cash equivalents fair value disclosure.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncreaseInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase in valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncreaseInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase In Deferred Tax Assets Valuation Allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncreaseInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase in deferred tax assets valuation allowance.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Leases [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Estimated Fair Value of Stock Options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease Assets [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Operating lease assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Segment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Segments [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Average share value of 5-day</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Share Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt securities in continuous unrealized loss position for more than 12 months</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">12 Months or Longer, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Instruments [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ZebiaiMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">ZebiAI.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ZebiaiMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">ZebiAI [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesIndustryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Industry Sector [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LeaseExpirationMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease agreement expiration date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LeaseExpirationMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease Expiration Month And Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LeaseExpirationMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease expiration month and year.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development tax credit carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Tax Credit Carryforwards, Research and Development</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research and development tax credit carryforwards.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash flows from investing activities:</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasicLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets Lease Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets lease liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforwards, not subject to expiration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Revenue from Contract with Customer, Excluding Assessed Tax, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Collaboration revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from Contract with Customer, Excluding Assessed Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">License and other revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ConcentrationOfCreditRiskAndSignificantSuppliersPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration of Credit Risk and Significant Suppliers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ConcentrationOfCreditRiskAndSignificantSuppliersPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Of Credit Risk And Significant Suppliers Policy [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ConcentrationOfCreditRiskAndSignificantSuppliersPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Concentration of credit risk and significant suppliers.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MarketBasedAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Market-Based Awards [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MarketBasedAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Market-based awards.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MarketBasedAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Market-Based Awards Member</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Reconciliation of Expected Income Tax (Benefit) Computed Using Federal Statutory Income Tax Rate to Effective Income Tax Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentIssuerAffiliationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Issuer Affiliation [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_VestingOfRestrictedStockUnitsShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Vesting of restricted stock units, Shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_VestingOfRestrictedStockUnitsShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Vesting of restricted stock units, Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit Facility</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Facility [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development arrangement, term of contract</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research And Development Arrangement Term Of Contract</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentArrangementTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Research and development arrangement, term of contract.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationAndLicenseArrangementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration And License Arrangement [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationAndLicenseArrangementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration And License Arrangement [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationAndLicenseArrangementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Collaboration and license arrangement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt Securities Available For Sale [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Liabilities, Net [Abstract]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line Two</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reconciliation to consolidated net loss:</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ProceedsFromIssuanceOfCommonStockThroughPrivatePlacementNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proceeds from issuance of common stock through Private Placement, net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ProceedsFromIssuanceOfCommonStockThroughPrivatePlacementNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from issuance of common stock through Private Placement, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Proceeds from Sale and Maturity of Other Investments, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Sale and Maturity of Other Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from maturities and sales of investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforwards, state</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Operating Loss Carryforwards, State and Local</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_VestingOfRestrictedCommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vesting of restricted common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_VestingOfRestrictedCommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Vesting Of Restricted Common Stock Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_VestingOfRestrictedCommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Vesting of restricted common stock value.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Anti-dilutive effect</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StandAloneSellingPricesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stand-alone selling prices.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StandAloneSellingPricesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Standalone Selling Prices ("SSP") [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StandAloneSellingPricesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Standalone Selling Prices [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_StandAloneSellingPricesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Stand-alone Selling Prices ("SSP") [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExpensesAndOtherCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accrued expenses and other current liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExpensesAndOtherCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Expenses And Other Current Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExpensesAndOtherCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total accrued expenses and other current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExpensesAndOtherCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total accrued expenses and other current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExternalResearchAndDevelopmentExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued External Research And Development Expense Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExternalResearchAndDevelopmentExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accrued external research and development expense current.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedExternalResearchAndDevelopmentExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">External research and development costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock compensation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">APIC, Share-Based Payment Arrangement, Increase for Cost Recognition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Accrued expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued expenses and other current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Liabilities, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total accrued expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, after Year Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Research and Development Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise price of stock options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Segment reporting, CODM, profit (loss) measure, how used, description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Income Tax Expense (Benefit), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Income tax benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BasisOfPresentationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basis of presentation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BasisOfPresentationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Basis Of Presentation Policy [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BasisOfPresentationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Basis of presentation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComponentsOfDeferredTaxAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Components of Deferred Tax Assets [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trading Symbol</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combinations [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total stockholders' equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfInvestmentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Investments [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFinStmtRestatementRecoveryAnalysisFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Financial Statement Restatement Recovery Analysis [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsOperatingLossCarryforwardsBeginToExpireYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets Operating Loss Carryforwards Begin To Expire Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsOperatingLossCarryforwardsBeginToExpireYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets operating loss carryforwards begin to expire year.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsOperatingLossCarryforwardsBeginToExpireYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforwards, begin to expire year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total gross deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrealized holding (loss) gain</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-Lived Tangible Asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Lived Tangible Asset [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Liabilities, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Liabilities, Noncurrent, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Unvested and outstanding restricted stock units [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted Stock Units (RSUs) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Stock Units (RSUs) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInDeferredRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Deferred Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInDeferredRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LandSubjectToGroundLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Land subject to ground leases</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total unrecognized compensation cost related to the unvested stock awards, Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DividendUponExtinguishmentOfPreferredStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Dividend upon extinguishment of preferred stock.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DividendUponExtinguishmentOfPreferredStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Extinguisment upon modification of Series C Preferred Stock (Note 9)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ESPP [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Employee Stock Purchase Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Employee stock purchase plan.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementExpertiseOfManagementResponsibleTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Expertise of Management Responsible [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Total Stock Compensation Expense Recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employer matching contribution</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Defined Contribution Plan, Employer Discretionary Contribution Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Geographical</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeasesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Leases [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CashAndCashEquivalentsMaturityDateDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maturity days for highly liquid investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CashAndCashEquivalentsMaturityDateDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash And Cash Equivalents Maturity Date Description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CashAndCashEquivalentsMaturityDateDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash and cash equivalents maturity date description.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AreaOfLand_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Area of land</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AreaOfLand_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Area of Land</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Use of Estimates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Use of Estimates, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and Development Services [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Research and development services.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ResearchAndDevelopmentServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Services [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration and License Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AdditionalPaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional payments to be received upon achievement of other specified development commercialization and sales based milestones does not exercise option to participate in collaboration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AdditionalPaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Payments To Be Received Upon Achievement Of Other Specified Development Commercialization And Sales Based Milestones Does Not Exercise Option To Participate In Collaboration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AdditionalPaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Additional payments to be received upon achievement of other specified development commercialization and sales based milestones does not exercise option to participate in collaboration.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash Equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfEliminatesOfTaxableIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act, percentage of eliminates of taxable income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfEliminatesOfTaxableIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act Percentage Of Eliminates Of Taxable Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfEliminatesOfTaxableIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act, percentage of eliminates of taxable income.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of convertible preferred stock into common stock upon initial public offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Conversion of Convertible Securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected volatility rate minimum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationUnrecognizedCompensationExpectedRecognitionTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share based compensation unrecognized compensation expected recognition term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationUnrecognizedCompensationExpectedRecognitionTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share based Compensation Unrecognized Compensation Expected Recognition Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationUnrecognizedCompensationExpectedRecognitionTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share based compensation unrecognized compensation expected recognition term.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Scenario [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dividend yield rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Dividend yield</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected dividend yield</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Exchange Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Fair Value of Available-for-Sale Investments by Type of Security</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentEarnoutPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Earnout Payments related to acquisition of ZebiAI</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentEarnoutPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business combination contingent consideration arrangements change in amount of contingent earnout payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentEarnoutPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination contingent consideration arrangements change in amount of contingent earnout payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentEarnoutPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Change in carrying value of Contingent Earnout Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RepurchaseAgreementCounterpartyNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Counterparty Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RepurchaseAgreementCounterpartyNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Counterparty Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DividendsCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Dividends, Common Stock, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DividendsCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Dividends declared</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DividendsCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dividends, Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred Tax Assets, Tax Credit Carryforwards, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax credit carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Tax Credit Carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Acquiree [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total operating expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Segment net loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate Intrinsic Value, Unvested Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share based Compensation Arrangement by Share Based Payment Award Options Non Vested Intrinsic Value 1</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share based compensation arrangement by share based payment award options non vested intrinsic value.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">RSU granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award R S Us Grants In Period Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share based compensation arrangement by share based payment award RSUs grants in period gross.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-Lived Tangible Asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Lived Tangible Asset [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementClassOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementClassOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: accumulated depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentRelatedToCollaborationOrOtherAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment related to collaboration or other agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentRelatedToCollaborationOrOtherAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment Related To Collaboration Or Other Agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentRelatedToCollaborationOrOtherAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payment related to collaboration or other agreements.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ContributionTowardTheCostOfConstructionAndTenantImprovementsForThePremises_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contribution toward the cost of construction and tenant improvements for the premises</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ContributionTowardTheCostOfConstructionAndTenantImprovementsForThePremises_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contribution toward the cost of construction and tenant improvements for the premises</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ContributionTowardTheCostOfConstructionAndTenantImprovementsForThePremises_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contribution toward the cost of construction and tenant improvements for the premises.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Disclosures [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Measurements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonesPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestones paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonesPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Milestones Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonesPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Milestones paid.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average grant date fair value of stock option granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and Development Arrangement, Contract to Perform for Others, Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Arrangement, Contract to Perform for Others, Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities and stockholders' equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Right of use asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prepaid Expense, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Prepaid Expense, Current, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepaid expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Prepaid balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares, vested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Supplemental Cash Flow Information [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Supplemental disclosure of non-cash activities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LaboratoryEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Laboratory Equipment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LaboratoryEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Laboratory Equipment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LaboratoryEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Laboratory equipment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationAndRetirementDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retirement Benefits [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net loss per share, diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings Per Share, Diluted, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net loss attributable to common stockholders per share, diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Leasehold Improvements [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Leasehold Improvements [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncomeTaxDisclosureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Tax Disclosure [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncomeTaxDisclosureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Disclosure [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncomeTaxDisclosureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Income tax disclosure.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Liabilities assumed in asset acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities assumed in asset acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockVotingRights_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common Stock, Voting Rights</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockVotingRights_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Voting Rights</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Hierarchy and NAV</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by (used in) investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Investing Activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioForecastMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Forecast [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioForecastMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Forecast [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock shares sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, New Issues</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock, net, shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentMilestonesPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Contingent Consideration Liability Contingent Milestones Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentMilestonesPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination contingent consideration liability contingent milestones payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentMilestonesPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination contingent consideration liability contingent milestones payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Unrecognized Tax Benefits, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Unrecognized Tax Benefits, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrecognized tax benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrecognized Tax Benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Share-Based Compensation Arrangement by Share-Based Payment Award, Option, Nonvested, Weighted Average Exercise Price, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Option, Nonvested, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Weighted Average Exercise Price Per Share, Unvested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price Per Share, Unvested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationsArrangementsByShareBasedPaymentAwardRSUsReleasedInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares, released</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationsArrangementsByShareBasedPaymentAwardRSUsReleasedInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensations Arrangements By Share Based Payment Award R S Us Released In Period Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationsArrangementsByShareBasedPaymentAwardRSUsReleasedInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share based compensations arrangements by share based payment award RSUs released in period gross.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentIssuerAffiliationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Issuer Affiliation [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vesting period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseExistenceOfOptionToExtend_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease option to extent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseExistenceOfOptionToExtend_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Existence of Option to Extend [true false]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Filer Category</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PercentageOfPaymentRelatedToCollaborationOrOtherAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of payment related to collaboration or other agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PercentageOfPaymentRelatedToCollaborationOrOtherAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Payment Related To Collaboration Or Other Agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PercentageOfPaymentRelatedToCollaborationOrOtherAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of payment related to collaboration or other agreements.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Time-BasedRSUsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Time-Based R S U's.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Time-BasedRSUsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Time-Based RSUs [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Time-BasedRSUsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Time-Based RSUs [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ReservedSharesOfCommonStockForFutureIssuanceTableTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Reserved Shares of Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ReservedSharesOfCommonStockForFutureIssuanceTableTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reserved Shares Of Common Stock For Future Issuance Table Table [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ReservedSharesOfCommonStockForFutureIssuanceTableTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tabular disclosure of reserved shares of common stock for future issuance.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationConsiderationTransferredEquityInterestsIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination consideration transferred equity interests issued.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationConsiderationTransferredEquityInterestsIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business combination consideration transferred equity interests issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationConsiderationTransferredEquityInterestsIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate fair value consideration transferred</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DevelopmentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Development milestone payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DevelopmentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Development Milestone Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DevelopmentMilestonePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Development milestone payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsContractualTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contractual term of stock options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsContractualTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Contractual Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsContractualTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share-based compensation arrangement by share-based payment award, fair value assumptions, contractual term.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Fiscal Year End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, Undiscounted Excess Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LeaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LeaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LeaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock compensation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Share-based Payment Arrangement, Noncash Expense, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Noncash Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentForTransferOfActivePharmaceuticalIngredient_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment For Transfer Of Active Pharmaceutical Ingredient</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentForTransferOfActivePharmaceuticalIngredient_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payment for transfer of active pharmaceutical ingredient.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PaymentForTransferOfActivePharmaceuticalIngredient_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment for transfer active pharmaceutical ingredient and other material</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party Transaction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transaction [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate Intrinsic Value, Outstanding Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PrecisionOncologyAndGeneticDiseaseIndicationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">precision oncology and genetic disease indications.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PrecisionOncologyAndGeneticDiseaseIndicationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Precision Oncology And Genetic Disease Indications [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PrecisionOncologyAndGeneticDiseaseIndicationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Precision Oncology and Genetic Disease Indications [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseExistenceOfOptionToTerminate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease option to terminate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseExistenceOfOptionToTerminate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Existence of Option to Terminate [true false]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Registrant Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total, Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total, Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Total, Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ProceedsFromIssuanceOfCommonStockViaAtTheMarketOfferingsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds From Issuance Of Common Stock Via At The Market Offerings Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ProceedsFromIssuanceOfCommonStockViaAtTheMarketOfferingsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proceeds from issuance of common stock via at the market offerings net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ProceedsFromIssuanceOfCommonStockViaAtTheMarketOfferingsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from issuance of common stock via at-the-market offerings, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of contingent milestone payments and earnout payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Contingent consideration liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Contingent Consideration, Liability, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommissionsAndOtherOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commissions and other offering expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommissionsAndOtherOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commissions And Other Offering Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommissionsAndOtherOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commissions and other offering expenses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net Loss Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Letter of credit expiration date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Letter of credit expiry date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Maturity Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Emerging Growth Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MoneyMarketFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Money market funds [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MoneyMarketFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Money Market Funds [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Liabilities, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Weighted Average Number of Shares Outstanding, Basic, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average shares of common stock, basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseLiabilitiesNetOfCurrentPortionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease liabilities, net of current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseLiabilitiesNetOfCurrentPortionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease Liabilities Net Of Current Portion [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OperatingLeaseLiabilitiesNetOfCurrentPortionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Operating lease liabilities net of current portion.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NonRule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non Rule 10b51 Arr Modified Flag.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NonRule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non Rule 10b51 Arr Modified Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NonRule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-Rule 10b5-1 Arrangement Modified</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected volatility rate maximum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock shares authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares Authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPeriodOfQualifiedImprovementPropertyForCostRecovery_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act, period of qualified improvement property for cost-recovery</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPeriodOfQualifiedImprovementPropertyForCostRecovery_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act Period Of Qualified Improvement Property For Cost Recovery</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPeriodOfQualifiedImprovementPropertyForCostRecovery_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act, Period of qualified improvement property for cost-recovery.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and equipment, useful life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Useful Life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net proceeds</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from issuance of common stock upon exercise of stock options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Issuance of Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 1 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 1 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounts payable and accrued expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Accounts Payable and Accrued Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Documents Incorporated by Reference [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Documents Incorporated by Reference</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price Per Share, Granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instrument</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Instrument [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Remaining Contractual Life, Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net Loss Per Common Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">General and administrative expenses [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">General and Administrative Expense [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment of Long-Lived Assets</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AverageStockPriceUponMilestoneSettlement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Average stock price upon milestone settlement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AverageStockPriceUponMilestoneSettlement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Average stock price upon milestone settlement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AverageStockPriceUponMilestoneSettlement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Average stock price upon milestone settlement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Income Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other income (expense).</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other income (expense)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other income (expense)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Other (income) expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_HampshireStreetCambridgeMassachusettsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Hampshire street, Cambridge, Massachusetts&gt; [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_HampshireStreetCambridgeMassachusettsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Hampshire Street, Cambridge, Massachusetts [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_HampshireStreetCambridgeMassachusettsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">60 Hampshire Street [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock upon acquisition of ZebiAI</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskRoleOfManagementTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Role of Management [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt Securities, Available-for-sale, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Policies [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesCPreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Series C Preferred Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesCPreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Series C Preferred Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Stock Option Activity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Option, Activity [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NatureOfBusinessAndBasisOfPresentationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nature of Business and Basis of Presentation [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NatureOfBusinessAndBasisOfPresentationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nature Of Business And Basis Of Presentation [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NatureOfBusinessAndBasisOfPresentationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Nature of business and basis of presentation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfOperatingLeasedAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Operating Leased Assets [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfOperatingLeasedAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Operating Leased Assets [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stockholders' equity:</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfMilestoneTargets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Milestone Targets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfMilestoneTargets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of milestone targets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MaximumAdditionalAmountReceivedUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum additional amount received upon milestone achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MaximumAdditionalAmountReceivedUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum Additional Amount Received Upon Milestone Achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MaximumAdditionalAmountReceivedUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Maximum additional amount received upon milestone achievement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Income, Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeOther_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Interest income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statement [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ExternalCostsForProgramsInClinicalTrials_lbl" xlink:role="http://www.xbrl.org/2003/role/label">External Costs for Programs in Clinical Trials</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ExternalCostsForProgramsInClinicalTrials_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">External costs for programs in clinical trials.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ExternalCostsForProgramsInClinicalTrials_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">External costs for programs in clinical trials</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Property and Equipment, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_HRHER2BreastCancerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">HR+/HER2- breast cancer.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_HRHER2BreastCancerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">H R H E R 2 Breast Cancer [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_HRHER2BreastCancerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">HR+/HER2- Breast Cancer [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditCarryforwardsOrphanDrug_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Tax Credit Carryforwards, Orphan Drug</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditCarryforwardsOrphanDrug_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets, tax credit carryforwards, orphan drug.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsTaxCreditCarryforwardsOrphanDrug_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Orphan drug tax credit carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Requisite service period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock shares authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Act File Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity File Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segment Information</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net decrease in cash, cash equivalents, and restricted cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AdjustmentsOrReconcilingItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments or reconciling items</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AdjustmentsOrReconcilingItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Adjustments or reconciling items.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedProfessionalServicesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Professional services</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashEquivalentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash equivalents [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashEquivalentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Equivalents [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Sale of Investments</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State taxes, net of federal benefit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Shell Company</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NonRefundablePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non-refundable payments.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Geographical</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Domain]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_EffectiveIncomeTaxRateReconciliationPermanentDifferences_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Effective income tax rate reconciliation permanent differences.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Preferred Stock, Value, Issued, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Preferred Stock, Value, Issued, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Preferred Stock, Value, Issued, Total</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDescriptionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Description [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_WeightedAverageSalesPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Sales Price Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_WeightedAverageSalesPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Weighted average sales price per share.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_WeightedAverageSalesPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Weighted-average sales price of shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">City Area Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LettersOfCreditOutstandingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Letter of credit</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current liabilities</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommonStockRestrictionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock Restriction Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommonStockRestrictionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Common stock, restriction period.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LaboratoryAndComputerEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Laboratory and Computer Equipment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LaboratoryAndComputerEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Laboratory and computer equipment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_LaboratoryAndComputerEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Laboratory and Computer Equipment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income tax computed at federal statutory rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherthirdPartiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Third Parties [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherthirdPartiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Third Parties [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OtherthirdPartiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other third parties [member].</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of convertible preferred stock into common stock upon initial public offering, shares</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Local Phone Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AdditionalPaymentIncludedInRevenueUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Payment Included in Revenue Upon Achievement Of Other Specified Development Commercialization And Sales Based Milestones Does Not Exercise Option To Participate In Collaboration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AdditionalPaymentIncludedInRevenueUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Additional Payment Included in Revenue Upon Achievement Of Other Specified Development Commercialization And Sales Based Milestones Does Not Exercise Option To Participate In Collaboration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AdditionalPaymentIncludedInRevenueUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Additional payment included in revenue upon achievement of other specified development commercialization and sales based milestones does not exercise option to participate in collaboration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentEarnoutPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Contingent Earnout Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentEarnoutPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination contingent consideration liability, contingent earnout payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentEarnoutPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business combination contingent consideration liability, contingent earnout payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationContingentConsiderationLiabilityContingentEarnoutPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination contingent consideration liability, contingent earnout payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Preferred Stock, Shares Outstanding, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Preferred Stock, Shares Outstanding, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Outstanding</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_EmployeeRelatedExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee related expenses</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_GenentechAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Genentech Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_GenentechAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Genentech Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_GenentechAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Genentech agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationAndLicenseArrangementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration And License Arrangement [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationAndLicenseArrangementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration And License Arrangement [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationAndLicenseArrangementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Collaboration and license arrangement.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_SegmentNetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Segment net income (loss).</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent consideration payment description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration Arrangements, Description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments to Acquire Property, Plant, and Equipment, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Purchases of property and equipment</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Transition Report</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncreaseInCommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase in Common Stock Capital Shares Reserved For Future Issuance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_IncreaseInCommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase in common stock capital shares reserved for future issuance.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PostemploymentBenefitsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Postemployment Benefits [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Antidilutive Security, Excluded EPS Calculation [Table]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorFirmId_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Firm ID</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Minimum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Restricted Cash, Total</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievementForEachTargetAfterFirstThree_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Milestone payment due upon specified regulatory milestone achievement for each target after first three.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievementForEachTargetAfterFirstThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Milestone Payment Due Upon Specified Regulatory Milestone Achievement For Each Target After First Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievementForEachTargetAfterFirstThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone payment due for each target after first three target</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price Per Share, Unvested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Weighted Average Grant Date Fair Value, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Weighted Average Grant Date Fair Value, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional Paid-in Capital [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid-in Capital [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Well-known Seasoned Issuer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NatureOfBusinessAndBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nature Of Business And Basis Of Presentation [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NatureOfBusinessAndBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nature Of Business And Basis Of Presentation [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NatureOfBusinessAndBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Nature of business and basis of presentation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adjustments to reconcile net loss to net cash used in operating activities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Net of Tax [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other comprehensive (loss) income:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Statement Location</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Income Location, Balance [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Other Operating Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Increase (Decrease) in Other Operating Liabilities, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationAndLicenseArrangementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration And License Arrangement [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CollaborationAndLicenseArrangementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Collaboration and license arrangement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrealized (loss) gain on investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt Securities, Available-for-Sale, Unrealized Gain (Loss), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Gain (Loss)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CommitmentsAndContingenciesDisclosureLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commitments and contingencies disclosure.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Common Stock, Shares Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TwoThousandTwentyOneSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">2021 Sales Agreement [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TwoThousandTwentyOneSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two thousand twenty one sales agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfSharesWouldBeIssuedUponMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares that would be issued upon milestone achievement</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less than 12 Months, Fair Value</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsLossOnInitialConsolidationOfVariableInterestEntity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss on initial consolidation of VIE</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsLossOnInitialConsolidationOfVariableInterestEntity_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination recognized identifiable assets acquired and liabilities assumed assets loss on initial consolidation of variable interest entity.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TwoThousandSixteenPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Two Thousand Sixteen Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TwoThousandSixteenPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Sixteen Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TwoThousandSixteenPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2016 Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActMaximumPercentageOfInterestDeductedByTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act maximum percentage of interest deducted by tax payers.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActMaximumPercentageOfInterestDeductedByTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act Maximum Percentage Of Interest Deducted By Tax Payers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActMaximumPercentageOfInterestDeductedByTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act, maximum percentage of interest deducted by tax payers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_UnrecognizedCompensationRelatedToNonVestedAwardsGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrecognized compensation related to unvested market-based awards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_UnrecognizedCompensationRelatedToNonVestedAwardsGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrecognized Compensation Related To Non Vested Awards Granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_UnrecognizedCompensationRelatedToNonVestedAwardsGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Unrecognized compensation related to non vested awards granted.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInProcessResearchAndDevelopmentAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Acquired IPR&amp;D asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInProcessResearchAndDevelopmentAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed In Process Research And Development Asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInProcessResearchAndDevelopmentAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination recognized identifiable assets acquired and liabilities assumed in process research and development asset.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioUnspecifiedDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Scenario [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewPrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of new programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewPrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of New Programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewPrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of new programs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TwoThousandTwentyPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2020 Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TwoThousandTwentyPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Twenty Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_TwoThousandTwentyPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2020 Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestoneEventsAndRoyaltiesPaymentDueUponSpecifiedRegulatoryMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Milestone events and royalties payment due upon specified regulatory milestone achievement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestoneEventsAndRoyaltiesPaymentDueUponSpecifiedRegulatoryMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Milestone events and royalties payment due upon specified regulatory milestone achievement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MilestoneEventsAndRoyaltiesPaymentDueUponSpecifiedRegulatoryMilestoneAchievement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone events and royalties payment due</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Value, Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Common Stock, Value, Issued, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Common Stock, Value, Issued, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Common Stock, Value, Issued, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, $0.001 par value; 300,000,000 shares authorized as of December 31, 2024, and December 31, 2023; 167,755,715 and 127,462,409 shares issued and outstanding as of December 31, 2024 and December 31, 2023, respectively</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets, fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DevelopmentBasedMilestonePaymentsUnderAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Development based milestone payments under agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DevelopmentBasedMilestonePaymentsUnderAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Development Based Milestone Payments Under Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DevelopmentBasedMilestonePaymentsUnderAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Aggregate potential clinical development milestone payments available to be earned under a collaboration arrangement for each available target selected by the collaborator.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfInterestDeductedByTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act, percentage of interest deducted by tax payers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfInterestDeductedByTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act Percentage Of Interest Deducted By Tax Payers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_CARESActPercentageOfInterestDeductedByTaxPayers_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">CARES Act, percentage of interest deducted by tax payers.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsCapitalizedResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets capitalized research and development expense.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsCapitalizedResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets capitalized research and development expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_DeferredTaxAssetsCapitalizedResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capitalized R&amp;D</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementNatureAndPurpose_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaborative arrangement, purpose</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementNatureAndPurpose_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement, Nature and Purpose</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Incremental stock compensation expense recognized in connection with acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation expense associated with accelerated vesting for certain stock options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Accelerated Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContingentConsiderationTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Consideration Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Present value of operating lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total operating lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Frequency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Frequency [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Accrued Liabilities [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Accrued Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred Tax Assets, Operating Loss Carryforwards, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Operating Loss Carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and contingencies (Note 11)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Offering Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Offering expenses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_OfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Offering expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Incremental charges</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Plan Modification, Incremental Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">12 Months or Longer, Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">12 Months or Longer, Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Significant Accounting Policies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Segment Reporting Information, by Segment [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Reportable Segment Revenue, Operating Expenses, and Net Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PrecisionOncologyAndGeneticDiseasesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Precision Oncology And Genetic Diseases [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PrecisionOncologyAndGeneticDiseasesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Precision Oncology And Genetic Diseases [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PrecisionOncologyAndGeneticDiseasesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Precision Oncology And Genetic Diseases.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Research and development expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Expense (Excluding Acquired in Process Cost)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Accounts Receivable, after Allowance for Credit Loss, Current, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounts receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Receivable, after Allowance for Credit Loss, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and Development Arrangement, Contract to Perform for Others, Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Arrangement, Contract to Perform for Others, Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInCommodityContractAssetsAndLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Contract asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInCommodityContractAssetsAndLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Commodity Contract Assets and Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total lease payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementThirdPartyEngagedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Third Party Engaged [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PerformanceBasedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Performance-Based Stock Options [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_PerformanceBasedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Performance-based stock options.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedConsultingAndProfessionalServices_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accrued consulting and professional services.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedConsultingAndProfessionalServices_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Consulting and Professional Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedConsultingAndProfessionalServices_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Consulting and professional services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Small Business</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting Information [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesForAssessingIdentifyingAndManagingThreatsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforwards, federal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Operating Loss Carryforwards, Domestic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_EarnoutPaymentsCompletionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earnout payments completion period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_EarnoutPaymentsCompletionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnout Payments Completion Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_EarnoutPaymentsCompletionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Earnout payments completion period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Revenues_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total revenue</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USTreasurySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">U.S. treasury bills [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net acquired assets</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MarketBasedAwardsTwoThousandTwentyStockPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Market-Based Awards 2020 Stock Plan [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_MarketBasedAwardsTwoThousandTwentyStockPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Market-based awards two thousand twenty stock plan.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit Facility</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Facility [Axis]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_NumberOfNewDiscoveryStagePrograms_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of discovery stage programs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net amortization of premiums and discounts on investments</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Performance-BasedRSUsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Performance-Based R S Us.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_Performance-BasedRSUsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Performance-Based RSUs [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Weighted Average Exercise Price Per Share, Outstanding Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt securities unrealized loss position</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByAssetClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset Class [Axis]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_AccruedOtherExpensesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Right-of-Use Asset Obtained in Exchange for Operating Lease Liability</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_GenentechIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Genentech [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_GenentechIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Genentech Inc.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_GenentechIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Genentech Inc. [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Valuation allowance</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average remaining lease term</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementPositionsOrCommitteesResponsibleFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Positions or Committees Responsible [Flag]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounts payable</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grant Date Fair Value</link:label>
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  <xsd:element id="rlay_ProceedsFromIssuanceOfCommonStockViaAtTheMarketOfferingsNet" name="ProceedsFromIssuanceOfCommonStockViaAtTheMarketOfferingsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_CommitmentsAndContingenciesDisclosureLineItems" name="CommitmentsAndContingenciesDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_ResearchAndDevelopmentArrangementContractToPerformForOthersRenewalPeriod" name="ResearchAndDevelopmentArrangementContractToPerformForOthersRenewalPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_OperatingLeaseAssetsMember" name="OperatingLeaseAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentMilestonePayments" name="BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentMilestonePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_TwoThousandSixteenPlanMember" name="TwoThousandSixteenPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_GenentechAgreementMember" name="GenentechAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_StockIssuedDuringPeriodAdditionalSharesIssued" name="StockIssuedDuringPeriodAdditionalSharesIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_NumberOfNewPrograms" name="NumberOfNewPrograms" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_AccruedConsultingAndProfessionalServices" name="AccruedConsultingAndProfessionalServices" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_SharebasedCompensationsArrangementByShareBasedPaymentsAwardOptionsNonVestedIntrinsicValue1" name="SharebasedCompensationsArrangementByShareBasedPaymentsAwardOptionsNonVestedIntrinsicValue1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_CollaborationAndLicenseArrangementAbstract" name="CollaborationAndLicenseArrangementAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_MilestonePayments" name="MilestonePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_WeightedAverageNumberOfSharesOutstandingDiluted" name="WeightedAverageNumberOfSharesOutstandingDiluted" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_EarnoutPaymentsMember" name="EarnoutPaymentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardRsusReleasedInPeriodGross" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRsusReleasedInPeriodGross" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ExternalCostsForPlatformTechnologiesAndPreclinicalPrograms" name="ExternalCostsForPlatformTechnologiesAndPreclinicalPrograms" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedWeightedAverageRemainingContractualTerm" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievement" name="MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_CurrentAssetsMember" name="CurrentAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_EarnoutPaymentsCompletionPeriod" name="EarnoutPaymentsCompletionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ProceedsFromIssuanceOfCommonStockThroughFollowOnOfferingNet" name="ProceedsFromIssuanceOfCommonStockThroughFollowOnOfferingNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_IssuanceOfCommonStockInInitialPublicOfferingShares" name="IssuanceOfCommonStockInInitialPublicOfferingShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_NonRefundablePayments" name="NonRefundablePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_MaximumAdditionalAmountReceivedUponMilestoneAchievement" name="MaximumAdditionalAmountReceivedUponMilestoneAchievement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_AverageStockPriceUponMilestoneSettlement" name="AverageStockPriceUponMilestoneSettlement" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_TransferOfActivePharmaceuticalIngredientsMember" name="TransferOfActivePharmaceuticalIngredientsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_CommonStockSharesIssuedUponConversion" name="CommonStockSharesIssuedUponConversion" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_BmrHampshireLlcMember" name="BmrHampshireLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_PatentCostsPolicyTextBlock" name="PatentCostsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_OperatingLeaseLiabilitiesMember" name="OperatingLeaseLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_BusinessCombinationContingentConsiderationLiabilityContingentEarnoutPayments" name="BusinessCombinationContingentConsiderationLiabilityContingentEarnoutPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_AdjustmentsOrReconcilingItems" name="AdjustmentsOrReconcilingItems" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_UnderwritingDiscountsCommissionsAndOtherOfferingExpenses" name="UnderwritingDiscountsCommissionsAndOtherOfferingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_ChangeInFairValueOfContingentConsiderationLiabilities" name="ChangeInFairValueOfContingentConsiderationLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_PaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration" name="PaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_FollowOnOfferingMember" name="FollowOnOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_NumberOfNewDiscoveryStagePrograms" name="NumberOfNewDiscoveryStagePrograms" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_TwoThousandTwentyPlanMember" name="TwoThousandTwentyPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_ResearchAndManufacturingContractsPolicyTextBlock" name="ResearchAndManufacturingContractsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ResearchAndDevelopmentArrangementAnnualFee" name="ResearchAndDevelopmentArrangementAnnualFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_DeferredTaxAssetsTaxCreditsResearchAndDevelopmentBeginToExpireYear" name="DeferredTaxAssetsTaxCreditsResearchAndDevelopmentBeginToExpireYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_HampshireStreetCambridgeMassachusettsMember" name="HampshireStreetCambridgeMassachusettsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_CashAndCashEquivalentsMaturityDateDescription" name="CashAndCashEquivalentsMaturityDateDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_CARESActNetOperatingLossesCarryBackPeriod" name="CARESActNetOperatingLossesCarryBackPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_CommonStockRestrictionPeriod" name="CommonStockRestrictionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_AtTheMarketOfferingsMember" name="AtTheMarketOfferingsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_CARESActMaximumPercentageOfInterestDeductedByTaxPayers" name="CARESActMaximumPercentageOfInterestDeductedByTaxPayers" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_PerformanceBasedStockOptionsMember" name="PerformanceBasedStockOptionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_ContractWithCustomerCashReceived" name="ContractWithCustomerCashReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_DeferredTaxAssetsOperatingLossCarryforwardsBeginToExpireYear" name="DeferredTaxAssetsOperatingLossCarryforwardsBeginToExpireYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_DevelopmentBasedMilestonePaymentsUnderAgreement" name="DevelopmentBasedMilestonePaymentsUnderAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_CommonStockIssuedUponMilestoneAchievement" name="CommonStockIssuedUponMilestoneAchievement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_InvestmentsWithMaturityOfOneToTwoYearsMember" name="InvestmentsWithMaturityOfOneToTwoYearsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_NatureOfBusinessAndBasisOfPresentationLineItems" name="NatureOfBusinessAndBasisOfPresentationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInProcessResearchAndDevelopmentAsset" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInProcessResearchAndDevelopmentAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_ProceedsFromIssuanceOfCommonStockThroughExerciseOfStockOptions" name="ProceedsFromIssuanceOfCommonStockThroughExerciseOfStockOptions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_DeferredTaxAssetsCapitalizedResearchAndDevelopmentExpense" name="DeferredTaxAssetsCapitalizedResearchAndDevelopmentExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_DeferredTaxLiabilitiesOperatingLeaseAssets" name="DeferredTaxLiabilitiesOperatingLeaseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_ShareBasedCompensationsArrangementsByShareBasedPaymentAwardRSUsReleasedInPeriodGross" name="ShareBasedCompensationsArrangementsByShareBasedPaymentAwardRSUsReleasedInPeriodGross" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ElevarTherapeuticsIncMember" name="ElevarTherapeuticsIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_CARESActPercentageOfCorporateCharitableDeductionLimit" name="CARESActPercentageOfCorporateCharitableDeductionLimit" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ConcentrationOfCreditRiskAndSignificantSuppliersPolicyTextBlock" name="ConcentrationOfCreditRiskAndSignificantSuppliersPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_DeferredTaxAssetsTaxCreditCarryforwardsOrphanDrug" name="DeferredTaxAssetsTaxCreditCarryforwardsOrphanDrug" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_ProceedsFromIssuanceOfCommonStockThroughPrivatePlacementNet" name="ProceedsFromIssuanceOfCommonStockThroughPrivatePlacementNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_WeightedAverageSalesPricePerShare" name="WeightedAverageSalesPricePerShare" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_AccruedProfessionalServicesCurrent" name="AccruedProfessionalServicesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_TwoThousandTwentyFourSalesAgreementMember" name="TwoThousandTwentyFourSalesAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_AccruedExternalResearchAndDevelopmentExpenseCurrent" name="AccruedExternalResearchAndDevelopmentExpenseCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_MilestonePaymentsMember" name="MilestonePaymentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_AmountReceivableInAchievementOfRegulatoryAndCommercialMilestones" name="AmountReceivableInAchievementOfRegulatoryAndCommercialMilestones" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_OtherIncomeExpense" name="OtherIncomeExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_BinneyStreetCambridgeMassachusettsMember" name="BinneyStreetCambridgeMassachusettsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_InvestmentsWithMaturityOfOneYearOrLessMember" name="InvestmentsWithMaturityOfOneYearOrLessMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_SegmentNetIncomeLoss" name="SegmentNetIncomeLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_PropertyAndEquipmentMember" name="PropertyAndEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsLossOnInitialConsolidationOfVariableInterestEntity" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsLossOnInitialConsolidationOfVariableInterestEntity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_TaxCutsAndJobsActOf2017DescriptionOfCorporateTaxPayers" name="TaxCutsAndJobsActOf2017DescriptionOfCorporateTaxPayers" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_DescriptionOfNewAccountingPronouncementsNotYetAdoptedPolicyTextBlock" name="DescriptionOfNewAccountingPronouncementsNotYetAdoptedPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_DeferredTaxAssetsTaxCreditsOrphanDrugBeginToExpireYear" name="DeferredTaxAssetsTaxCreditsOrphanDrugBeginToExpireYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_BusinessCombinationContingentConsiderationLiabilityContingentMilestonesPayments" name="BusinessCombinationContingentConsiderationLiabilityContingentMilestonesPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_NumberOfSharesWouldBeIssuedUponMilestoneAchievements" name="NumberOfSharesWouldBeIssuedUponMilestoneAchievements" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievementForEachTargetThereafter" name="MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievementForEachTargetThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_LicenseAgreementTransactionPrice" name="LicenseAgreementTransactionPrice" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_VestingOfRestrictedStockUnitsShares" name="VestingOfRestrictedStockUnitsShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_OtherSegmentExpensesAbstract" name="OtherSegmentExpensesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_DEShawResearchMember" name="DEShawResearchMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_DeferredTaxAssetsDepreciationAndAmortization" name="DeferredTaxAssetsDepreciationAndAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_DevelopmentMilestonePayments" name="DevelopmentMilestonePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_MilestonesPaid" name="MilestonesPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_ResearchAndDevelopmentArrangementExpirationDate" name="ResearchAndDevelopmentArrangementExpirationDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_OfferingExpenses" name="OfferingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopment" name="DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_PaymentRelatedToCollaborationOrOtherAgreements" name="PaymentRelatedToCollaborationOrOtherAgreements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_CommitmentsAndContingenciesDisclosureTable" name="CommitmentsAndContingenciesDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_HRHER2BreastCancerMember" name="HRHER2BreastCancerMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_CashAndCashEquivalentsFairValueDisclosureAbstract" name="CashAndCashEquivalentsFairValueDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_DirectorsAndOfficersMember" name="DirectorsAndOfficersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_ZebiAITherapeuticsIncMember" name="ZebiAITherapeuticsIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_TwoThousandTwentyOneSalesAgreementMember" name="TwoThousandTwentyOneSalesAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_StandAloneSellingPricesMember" name="StandAloneSellingPricesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_NumberOfNewNovelPrograms" name="NumberOfNewNovelPrograms" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_TaxCutsAndJobsActOf2017MaximumPercentageOfInterestDeductedByTaxPayers" name="TaxCutsAndJobsActOf2017MaximumPercentageOfInterestDeductedByTaxPayers" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_IssuanceOfCommonStockUponMilestoneAchievement" name="IssuanceOfCommonStockUponMilestoneAchievement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_NumberOfMilestoneTargets" name="NumberOfMilestoneTargets" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsGrantsInPeriodGross" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsGrantsInPeriodGross" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_GenentechIncMember" name="GenentechIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_DividendUponExtinguishmentOfPreferredStock" name="DividendUponExtinguishmentOfPreferredStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_ExternalCostsForProgramsInClinicalTrials" name="ExternalCostsForProgramsInClinicalTrials" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_CARESActPercentageOfBonusDepreciation" name="CARESActPercentageOfBonusDepreciation" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ResearchAndDevelopmentArrangementTermOfContract" name="ResearchAndDevelopmentArrangementTermOfContract" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ContributionTowardTheCostOfConstructionAndTenantImprovementsForThePremises" name="ContributionTowardTheCostOfConstructionAndTenantImprovementsForThePremises" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_NumberOfDiscoveryStagePrograms" name="NumberOfDiscoveryStagePrograms" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedIntrinsicValue1" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedIntrinsicValue1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_CollaborationAndLicenseArrangementTable" name="CollaborationAndLicenseArrangementTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_ProceedsFromIssuanceOfCommonStockViaEmployeeStockPurchasePlan" name="ProceedsFromIssuanceOfCommonStockViaEmployeeStockPurchasePlan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_MilestonesRepayableCurrent" name="MilestonesRepayableCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_CurrentLiabilitiesMember" name="CurrentLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_AccruedCompensationCosts" name="AccruedCompensationCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_BusinessCombinationConsiderationTransferredEquityInterestsIssued" name="BusinessCombinationConsiderationTransferredEquityInterestsIssued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_PeriodicChangeInCostsToObtainLicenseAgreementWithinCurrentLiabilities" name="PeriodicChangeInCostsToObtainLicenseAgreementWithinCurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_UnrecognizedCompensationRelatedToNonVestedAwardsGranted" name="UnrecognizedCompensationRelatedToNonVestedAwardsGranted" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_EffectiveIncomeTaxRateReconciliationPermanentDifferences" name="EffectiveIncomeTaxRateReconciliationPermanentDifferences" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_EmployeeRelatedExpenses" name="EmployeeRelatedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_BasisOfPresentationPolicyTextBlock" name="BasisOfPresentationPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_ContractAssetsAndLiabilitiesPolicyPolicyTextBlock" name="ContractAssetsAndLiabilitiesPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_PercentageOfPaymentRelatedToCollaborationOrOtherAgreements" name="PercentageOfPaymentRelatedToCollaborationOrOtherAgreements" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_AdditionalPaymentIncludedInRevenueUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration" name="AdditionalPaymentIncludedInRevenueUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_PaymentForTransferOfActivePharmaceuticalIngredient" name="PaymentForTransferOfActivePharmaceuticalIngredient" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_OtherthirdPartiesMember" name="OtherthirdPartiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_Performance-BasedRSUsMember" name="Performance-BasedRSUsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_AmountReceivableUponAchievementOfRegulatoryAndCommercialMilestones" name="AmountReceivableUponAchievementOfRegulatoryAndCommercialMilestones" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_PrecisionOncologyAndGeneticDiseaseIndicationsMember" name="PrecisionOncologyAndGeneticDiseaseIndicationsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_NumberOfCommonStockIssuedUponMilestoneAchievements" name="NumberOfCommonStockIssuedUponMilestoneAchievements" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentEarnoutPayments" name="BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentEarnoutPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_DeferredTaxAssetsLeaseLiability" name="DeferredTaxAssetsLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_MilestonePaymentsCompletionPeriod" name="MilestonePaymentsCompletionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_AdditionalPaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration" name="AdditionalPaymentsToBeReceivedUponAchievementOfOtherSpecifiedDevelopmentCommercializationAndSalesBasedMilestonesDoesNotExerciseOptionToParticipateInCollaboration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_NumberOfNewGeneticDiseasePrograms" name="NumberOfNewGeneticDiseasePrograms" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="rlay_PaymentForUpfrontConsideration" name="PaymentForUpfrontConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievementForEachTargetAfterFirstThree" name="MilestonePaymentDueUponSpecifiedRegulatoryMilestoneAchievementForEachTargetAfterFirstThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_LeaseAgreementMember" name="LeaseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_TransferOfLicenseAndRelatedKnowHowMember" name="TransferOfLicenseAndRelatedKnowHowMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsContractualTerm" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsContractualTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_CARESActPeriodOfQualifiedImprovementPropertyForCostRecovery" name="CARESActPeriodOfQualifiedImprovementPropertyForCostRecovery" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_Rly2139AndEstrogenReceptorAlphaDegraderMember" name="Rly2139AndEstrogenReceptorAlphaDegraderMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_NonRule10B51ArrModifiedFlag" name="NonRule10B51ArrModifiedFlag" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_LeaseExpirationMonthAndYear" name="LeaseExpirationMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_Rule10B5ArrModifiedFlag" name="Rule10B5ArrModifiedFlag" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_IncreaseInCommonStockCapitalSharesReservedForFutureIssuance" name="IncreaseInCommonStockCapitalSharesReservedForFutureIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_UndesignatedpreferredstockMember" name="UndesignatedpreferredstockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_PercentageOfAdditionalCommonStockAuthorized" name="PercentageOfAdditionalCommonStockAuthorized" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_TimeBasedStockOptionsMember" name="TimeBasedStockOptionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_AccruedExpensesAndOtherCurrentLiabilities" name="AccruedExpensesAndOtherCurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_NumberOfSharesWouldBeIssuedUponMilestoneAchievement" name="NumberOfSharesWouldBeIssuedUponMilestoneAchievement" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_MilestoneEventsAndRoyaltiesPaymentDueUponSpecifiedRegulatoryMilestoneAchievement" name="MilestoneEventsAndRoyaltiesPaymentDueUponSpecifiedRegulatoryMilestoneAchievement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_ResearchAndDevelopmentServicesMember" name="ResearchAndDevelopmentServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_PercentageOfCommissionOwedToSalesAgentUnderAtTheMarketOffering" name="PercentageOfCommissionOwedToSalesAgentUnderAtTheMarketOffering" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_LicenseAndTransferAgreementMember" name="LicenseAndTransferAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_SignificantAccountingPoliciesLineItems" name="SignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_ScheduleOfOperatingLeasePresentationInConsolidatedBalanceSheetTableTextBlock" name="ScheduleOfOperatingLeasePresentationInConsolidatedBalanceSheetTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_SignificantAccountingPoliciesTable" name="SignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_BusinessCombinationContingentMilestonePayments" name="BusinessCombinationContingentMilestonePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_PeriodicChangeInAdditionsOfPropertyAndEquipmentWithinCurrentLiabilities" name="PeriodicChangeInAdditionsOfPropertyAndEquipmentWithinCurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_IncomeTaxDisclosureTable" name="IncomeTaxDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_CommonStockIssuedUponMilestoneAchievementMember" name="CommonStockIssuedUponMilestoneAchievementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_StockIssuedDuringPeriodValueAcquisitionNewIssues" name="StockIssuedDuringPeriodValueAcquisitionNewIssues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_CommissionsAndOtherOfferingExpenses" name="CommissionsAndOtherOfferingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="rlay_LaboratoryAndComputerEquipmentMember" name="LaboratoryAndComputerEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="rlay_AccruedExpensesTextBlock" name="AccruedExpensesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_CARESActPercentageOfInterestDeductedByTaxPayers" name="CARESActPercentageOfInterestDeductedByTaxPayers" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="rlay_IncreaseDecreaseInOperatingLeaseAssetsAndLiabilitiesNet" name="IncreaseDecreaseInOperatingLeaseAssetsAndLiabilitiesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="rlay_TDSecuritiesMember" name="TDSecuritiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
</xsd:schema>
