3.26.1 html 161 383 1 false 60 0 false 8 false false R1.htm 0000001 - Document - Cover Sheet http://werewolftx.com/role/Cover Cover Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://werewolftx.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 9952151 - Statement - Consolidated Balance Sheets Sheet http://werewolftx.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 3 false false R4.htm 9952152 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://werewolftx.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 4 false false R5.htm 9952153 - Statement - Consolidated Statements of Operations Sheet http://werewolftx.com/role/ConsolidatedStatementsofOperations Consolidated Statements of Operations Statements 5 false false R6.htm 9952154 - Statement - Consolidated Statements of Stockholders??? Equity Sheet http://werewolftx.com/role/ConsolidatedStatementsofStockholdersEquity Consolidated Statements of Stockholders??? Equity Statements 6 false false R7.htm 9952155 - Statement - Consolidated Statements of Stockholders??? Equity (Parentheticals) Sheet http://werewolftx.com/role/ConsolidatedStatementsofStockholdersEquityParentheticals Consolidated Statements of Stockholders??? Equity (Parentheticals) Statements 7 false false R8.htm 9952156 - Statement - Consolidated Statements of Cash Flows Sheet http://werewolftx.com/role/ConsolidatedStatementsofCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 9952157 - Disclosure - Nature of Business Sheet http://werewolftx.com/role/NatureofBusiness Nature of Business Notes 9 false false R10.htm 9952158 - Disclosure - Strategic Review and Liquidity Sheet http://werewolftx.com/role/StrategicReviewandLiquidity Strategic Review and Liquidity Notes 10 false false R11.htm 9952159 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies Sheet http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies Basis of Presentation and Summary of Significant Accounting Policies Notes 11 false false R12.htm 9952160 - Disclosure - Collaboration and License Agreement Sheet http://werewolftx.com/role/CollaborationandLicenseAgreement Collaboration and License Agreement Notes 12 false false R13.htm 9952161 - Disclosure - Financial Instruments and Fair Value Measurements Sheet http://werewolftx.com/role/FinancialInstrumentsandFairValueMeasurements Financial Instruments and Fair Value Measurements Notes 13 false false R14.htm 9952162 - Disclosure - Property and Equipment, Net Sheet http://werewolftx.com/role/PropertyandEquipmentNet Property and Equipment, Net Notes 14 false false R15.htm 9952163 - Disclosure - Accrued Expenses and Other Current Liabilities Sheet http://werewolftx.com/role/AccruedExpensesandOtherCurrentLiabilities Accrued Expenses and Other Current Liabilities Notes 15 false false R16.htm 9952164 - Disclosure - Term Loan Sheet http://werewolftx.com/role/TermLoan Term Loan Notes 16 false false R17.htm 9952165 - Disclosure - Common and Preferred Stock Sheet http://werewolftx.com/role/CommonandPreferredStock Common and Preferred Stock Notes 17 false false R18.htm 9952166 - Disclosure - Stock-based Compensation Sheet http://werewolftx.com/role/StockbasedCompensation Stock-based Compensation Notes 18 false false R19.htm 9952167 - Disclosure - Commitment and Contingencies Sheet http://werewolftx.com/role/CommitmentandContingencies Commitment and Contingencies Notes 19 false false R20.htm 9952168 - Disclosure - Income Taxes Sheet http://werewolftx.com/role/IncomeTaxes Income Taxes Notes 20 false false R21.htm 9952169 - Disclosure - Related Parties Sheet http://werewolftx.com/role/RelatedParties Related Parties Notes 21 false false R22.htm 9952170 - Disclosure - Defined Contribution Benefit Plan Sheet http://werewolftx.com/role/DefinedContributionBenefitPlan Defined Contribution Benefit Plan Notes 22 false false R23.htm 9952171 - Disclosure - Net Loss Attributable to Common Stockholders per Share Sheet http://werewolftx.com/role/NetLossAttributabletoCommonStockholdersperShare Net Loss Attributable to Common Stockholders per Share Notes 23 false false R24.htm 9952172 - Disclosure - Segment Information Sheet http://werewolftx.com/role/SegmentInformation Segment Information Notes 24 false false R25.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 25 false false R26.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 26 false false R27.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 27 false false R28.htm 9955511 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies) Sheet http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies Basis of Presentation and Summary of Significant Accounting Policies (Policies) Policies http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies 28 false false R29.htm 9955512 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables) Sheet http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesTables Basis of Presentation and Summary of Significant Accounting Policies (Tables) Tables http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies 29 false false R30.htm 9955513 - Disclosure - Financial Instruments and Fair Value Measurements (Tables) Sheet http://werewolftx.com/role/FinancialInstrumentsandFairValueMeasurementsTables Financial Instruments and Fair Value Measurements (Tables) Tables http://werewolftx.com/role/FinancialInstrumentsandFairValueMeasurements 30 false false R31.htm 9955514 - Disclosure - Property and Equipment, Net (Tables) Sheet http://werewolftx.com/role/PropertyandEquipmentNetTables Property and Equipment, Net (Tables) Tables http://werewolftx.com/role/PropertyandEquipmentNet 31 false false R32.htm 9955515 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables) Sheet http://werewolftx.com/role/AccruedExpensesandOtherCurrentLiabilitiesTables Accrued Expenses and Other Current Liabilities (Tables) Tables http://werewolftx.com/role/AccruedExpensesandOtherCurrentLiabilities 32 false false R33.htm 9955516 - Disclosure - Term Loan (Tables) Sheet http://werewolftx.com/role/TermLoanTables Term Loan (Tables) Tables http://werewolftx.com/role/TermLoan 33 false false R34.htm 9955517 - Disclosure - Common and Preferred Stock (Tables) Sheet http://werewolftx.com/role/CommonandPreferredStockTables Common and Preferred Stock (Tables) Tables http://werewolftx.com/role/CommonandPreferredStock 34 false false R35.htm 9955518 - Disclosure - Stock-based Compensation (Tables) Sheet http://werewolftx.com/role/StockbasedCompensationTables Stock-based Compensation (Tables) Tables http://werewolftx.com/role/StockbasedCompensation 35 false false R36.htm 9955519 - Disclosure - Commitments and Contingencies (Tables) Sheet http://werewolftx.com/role/CommitmentsandContingenciesTables Commitments and Contingencies (Tables) Tables 36 false false R37.htm 9955520 - Disclosure - Income Taxes (Tables) Sheet http://werewolftx.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://werewolftx.com/role/IncomeTaxes 37 false false R38.htm 9955521 - Disclosure - Net Loss Attributable to Common Stockholders per Share (Tables) Sheet http://werewolftx.com/role/NetLossAttributabletoCommonStockholdersperShareTables Net Loss Attributable to Common Stockholders per Share (Tables) Tables http://werewolftx.com/role/NetLossAttributabletoCommonStockholdersperShare 38 false false R39.htm 9955522 - Disclosure - Segment Information (Tables) Sheet http://werewolftx.com/role/SegmentInformationTables Segment Information (Tables) Tables http://werewolftx.com/role/SegmentInformation 39 false false R40.htm 9955523 - Disclosure - Nature of Business (Details) Sheet http://werewolftx.com/role/NatureofBusinessDetails Nature of Business (Details) Details http://werewolftx.com/role/NatureofBusiness 40 false false R41.htm 9955524 - Disclosure - Strategic Review and Liquidity (Details) Sheet http://werewolftx.com/role/StrategicReviewandLiquidityDetails Strategic Review and Liquidity (Details) Details http://werewolftx.com/role/StrategicReviewandLiquidity 41 false false R42.htm 9955525 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) Sheet http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesNarrativeDetails Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) Details http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesTables 42 false false R43.htm 9955526 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash and Cash Equivalents (Details) Sheet http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesCashCashEquivalentsandRestrictedCashandCashEquivalentsDetails Basis of Presentation and Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash and Cash Equivalents (Details) Details 43 false false R44.htm 9955527 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Details) Sheet http://werewolftx.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesScheduleofPropertyPlantandEquipmentDetails Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Details) Details 44 false false R45.htm 9955528 - Disclosure - Collaboration and License Agreement - Narrative (Details) Sheet http://werewolftx.com/role/CollaborationandLicenseAgreementNarrativeDetails Collaboration and License Agreement - Narrative (Details) Details 45 false false R46.htm 9955529 - Disclosure - Financial Instruments and Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) Sheet http://werewolftx.com/role/FinancialInstrumentsandFairValueMeasurementsAssetsMeasuredatFairValueonaRecurringBasisDetails Financial Instruments and Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) Details 46 false false R47.htm 9955530 - Disclosure - Financial Instruments and Fair Value Measurements - Narrative (Details) Sheet http://werewolftx.com/role/FinancialInstrumentsandFairValueMeasurementsNarrativeDetails Financial Instruments and Fair Value Measurements - Narrative (Details) Details http://werewolftx.com/role/FinancialInstrumentsandFairValueMeasurementsTables 47 false false R48.htm 9955531 - Disclosure - Financial Instruments and Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) Sheet http://werewolftx.com/role/FinancialInstrumentsandFairValueMeasurementsFairValueAssetsMeasuredonRecurringBasisUnobservableInputReconciliationDetails Financial Instruments and Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) Details 48 false false R49.htm 9955532 - Disclosure - Financial Instruments and Fair Value Measurements - Unobservable Inputs (Details) Sheet http://werewolftx.com/role/FinancialInstrumentsandFairValueMeasurementsUnobservableInputsDetails Financial Instruments and Fair Value Measurements - Unobservable Inputs (Details) Details 49 false false R50.htm 9955533 - Disclosure - Property and Equipment, Net (Details) Sheet http://werewolftx.com/role/PropertyandEquipmentNetDetails Property and Equipment, Net (Details) Details http://werewolftx.com/role/PropertyandEquipmentNetTables 50 false false R51.htm 9955534 - Disclosure - Accrued Expenses and Other Current Liabilities (Details) Sheet http://werewolftx.com/role/AccruedExpensesandOtherCurrentLiabilitiesDetails Accrued Expenses and Other Current Liabilities (Details) Details http://werewolftx.com/role/AccruedExpensesandOtherCurrentLiabilitiesTables 51 false false R52.htm 9955535 - Disclosure - Term Loan - Narrative (Details) Sheet http://werewolftx.com/role/TermLoanNarrativeDetails Term Loan - Narrative (Details) Details 52 false false R53.htm 9955536 - Disclosure - Term Loan - Schedule of Outstanding Term Loans Payable (Details) Sheet http://werewolftx.com/role/TermLoanScheduleofOutstandingTermLoansPayableDetails Term Loan - Schedule of Outstanding Term Loans Payable (Details) Details 53 false false R54.htm 9955537 - Disclosure - Term Loan - Schedule of Interest Expense (Details) Sheet http://werewolftx.com/role/TermLoanScheduleofInterestExpenseDetails Term Loan - Schedule of Interest Expense (Details) Details 54 false false R55.htm 9955538 - Disclosure - Term Loan - Schedule of Total Principle Payments Maturities (Details) Sheet http://werewolftx.com/role/TermLoanScheduleofTotalPrinciplePaymentsMaturitiesDetails Term Loan - Schedule of Total Principle Payments Maturities (Details) Details 55 false false R56.htm 9955539 - Disclosure - Common and Preferred Stock - Narrative (Details) Sheet http://werewolftx.com/role/CommonandPreferredStockNarrativeDetails Common and Preferred Stock - Narrative (Details) Details 56 false false R57.htm 9955540 - Disclosure - Common and Preferred Stock - Schedule of Common Stock Reserved for Issuance (Details) Sheet http://werewolftx.com/role/CommonandPreferredStockScheduleofCommonStockReservedforIssuanceDetails Common and Preferred Stock - Schedule of Common Stock Reserved for Issuance (Details) Details 57 false false R58.htm 9955541 - Disclosure - Stock-based Compensation - Narrative (Details) Sheet http://werewolftx.com/role/StockbasedCompensationNarrativeDetails Stock-based Compensation - Narrative (Details) Details 58 false false R59.htm 9955542 - Disclosure - Stock-based Compensation - Expense Recognized (Details) Sheet http://werewolftx.com/role/StockbasedCompensationExpenseRecognizedDetails Stock-based Compensation - Expense Recognized (Details) Details 59 false false R60.htm 9955543 - Disclosure - Stock-based Compensation - Weighted Average Assumptions (Details) Sheet http://werewolftx.com/role/StockbasedCompensationWeightedAverageAssumptionsDetails Stock-based Compensation - Weighted Average Assumptions (Details) Details 60 false false R61.htm 9955544 - Disclosure - Stock-based Compensation - Stock Option Activity (Details) Sheet http://werewolftx.com/role/StockbasedCompensationStockOptionActivityDetails Stock-based Compensation - Stock Option Activity (Details) Details 61 false false R62.htm 9955545 - Disclosure - Commitments and Contingencies - Narrative (Details) Sheet http://werewolftx.com/role/CommitmentsandContingenciesNarrativeDetails Commitments and Contingencies - Narrative (Details) Details 62 false false R63.htm 9955546 - Disclosure - Commitments and Contingencies - Summarizes Operating Lease Costs (Details) Sheet http://werewolftx.com/role/CommitmentsandContingenciesSummarizesOperatingLeaseCostsDetails Commitments and Contingencies - Summarizes Operating Lease Costs (Details) Details 63 false false R64.htm 9955547 - Disclosure - Commitments and Contingencies - Summarizes The Lease Term and Discount Rate For Operating Leases (Details) Sheet http://werewolftx.com/role/CommitmentsandContingenciesSummarizesTheLeaseTermandDiscountRateForOperatingLeasesDetails Commitments and Contingencies - Summarizes The Lease Term and Discount Rate For Operating Leases (Details) Details 64 false false R65.htm 9955548 - Disclosure - Commitments and Contingencies - Future Minimum Lease Payment (Details) Sheet http://werewolftx.com/role/CommitmentsandContingenciesFutureMinimumLeasePaymentDetails Commitments and Contingencies - Future Minimum Lease Payment (Details) Details 65 false false R66.htm 9955549 - Disclosure - Income Taxes - Narrative (Details) Sheet http://werewolftx.com/role/IncomeTaxesNarrativeDetails Income Taxes - Narrative (Details) Details 66 false false R67.htm 9955550 - Disclosure - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Sheet http://werewolftx.com/role/IncomeTaxesScheduleofEffectiveIncomeTaxRateReconciliationDetails Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Details 67 false false R68.htm 9955551 - Disclosure - Income Taxes -Schedule of Deferred Tax Assets and Liabilities (Details) Sheet http://werewolftx.com/role/IncomeTaxesScheduleofDeferredTaxAssetsandLiabilitiesDetails Income Taxes -Schedule of Deferred Tax Assets and Liabilities (Details) Details 68 false false R69.htm 9955552 - Disclosure - Related Parties (Details) Sheet http://werewolftx.com/role/RelatedPartiesDetails Related Parties (Details) Details http://werewolftx.com/role/RelatedParties 69 false false R70.htm 9955553 - Disclosure - Defined Contribution Benefit Plan (Details) Sheet http://werewolftx.com/role/DefinedContributionBenefitPlanDetails Defined Contribution Benefit Plan (Details) Details http://werewolftx.com/role/DefinedContributionBenefitPlan 70 false false R71.htm 9955554 - Disclosure - Net Loss Attributable to Common Stockholders per Share - Common Stockholder (Details) Sheet http://werewolftx.com/role/NetLossAttributabletoCommonStockholdersperShareCommonStockholderDetails Net Loss Attributable to Common Stockholders per Share - Common Stockholder (Details) Details 71 false false R72.htm 9955555 - Disclosure - Net Loss Attributable to Common Stockholders per Share - Summary of Earnings per Share (Details) Sheet http://werewolftx.com/role/NetLossAttributabletoCommonStockholdersperShareSummaryofEarningsperShareDetails Net Loss Attributable to Common Stockholders per Share - Summary of Earnings per Share (Details) Details 72 false false R73.htm 9955556 - Disclosure - Segment Information (Details) Sheet http://werewolftx.com/role/SegmentInformationDetails Segment Information (Details) Details http://werewolftx.com/role/SegmentInformationTables 73 false false All Reports Book All Reports howl-20251231.htm howl-20251231.xsd howl-20251231_cal.xml howl-20251231_def.xml howl-20251231_lab.xml howl-20251231_pre.xml howl-20251231_g1.jpg howl-20251231_g2.jpg http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true