3.26.1 html 111 207 1 false 45 0 false 8 false false R1.htm 0000001 - Document - Cover Sheet http://arbutusbio.com/role/Cover Cover Cover 1 false false R2.htm 9952151 - Statement - Condensed Consolidated Balance Sheets (Unaudited) Sheet http://arbutusbio.com/role/CondensedConsolidatedBalanceSheetsUnaudited Condensed Consolidated Balance Sheets (Unaudited) Statements 2 false false R3.htm 9952152 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) Sheet http://arbutusbio.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) Statements 3 false false R4.htm 9952153 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) Sheet http://arbutusbio.com/role/CondensedConsolidatedStatementsofOperationsandComprehensiveIncomeLossUnaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) Statements 4 false false R5.htm 9952154 - Statement - Condensed Consolidated Statement of Stockholders??? Equity (Unaudited) Sheet http://arbutusbio.com/role/CondensedConsolidatedStatementofStockholdersEquityUnaudited Condensed Consolidated Statement of Stockholders??? Equity (Unaudited) Statements 5 false false R6.htm 9952155 - Statement - Condensed Consolidated Statements of Cash Flow (Unaudited) Sheet http://arbutusbio.com/role/CondensedConsolidatedStatementsofCashFlowUnaudited Condensed Consolidated Statements of Cash Flow (Unaudited) Statements 6 false false R7.htm 9952156 - Disclosure - Nature of business and future operations Sheet http://arbutusbio.com/role/Natureofbusinessandfutureoperations Nature of business and future operations Notes 7 false false R8.htm 9952157 - Disclosure - Significant accounting policies Sheet http://arbutusbio.com/role/Significantaccountingpolicies Significant accounting policies Notes 8 false false R9.htm 9952158 - Disclosure - Fair value measurements Sheet http://arbutusbio.com/role/Fairvaluemeasurements Fair value measurements Notes 9 false false R10.htm 9952159 - Disclosure - Investments in marketable securities Sheet http://arbutusbio.com/role/Investmentsinmarketablesecurities Investments in marketable securities Notes 10 false false R11.htm 9952160 - Disclosure - Investment in Genevant Sheet http://arbutusbio.com/role/InvestmentinGenevant Investment in Genevant Notes 11 false false R12.htm 9952161 - Disclosure - Accounts payable and accrued liabilities Sheet http://arbutusbio.com/role/Accountspayableandaccruedliabilities Accounts payable and accrued liabilities Notes 12 false false R13.htm 9952162 - Disclosure - Sale of future royalties Sheet http://arbutusbio.com/role/Saleoffutureroyalties Sale of future royalties Notes 13 false false R14.htm 9952163 - Disclosure - Contingencies and commitments Sheet http://arbutusbio.com/role/Contingenciesandcommitments Contingencies and commitments Notes 14 false false R15.htm 9952164 - Disclosure - Collaborations, contracts and licensing agreements Sheet http://arbutusbio.com/role/Collaborationscontractsandlicensingagreements Collaborations, contracts and licensing agreements Notes 15 false false R16.htm 9952165 - Disclosure - Shareholders??? equity Sheet http://arbutusbio.com/role/Shareholdersequity Shareholders??? equity Notes 16 false false R17.htm 9952166 - Disclosure - Segment Reporting Sheet http://arbutusbio.com/role/SegmentReporting Segment Reporting Notes 17 false false R18.htm 9952167 - Disclosure - Restructuring Sheet http://arbutusbio.com/role/Restructuring Restructuring Notes 18 false false R19.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 19 false false R20.htm 9955511 - Disclosure - Significant accounting policies (Policies) Sheet http://arbutusbio.com/role/SignificantaccountingpoliciesPolicies Significant accounting policies (Policies) Policies 20 false false R21.htm 9955512 - Disclosure - Fair value measurements (Tables) Sheet http://arbutusbio.com/role/FairvaluemeasurementsTables Fair value measurements (Tables) Tables http://arbutusbio.com/role/Fairvaluemeasurements 21 false false R22.htm 9955513 - Disclosure - Investments in marketable securities (Tables) Sheet http://arbutusbio.com/role/InvestmentsinmarketablesecuritiesTables Investments in marketable securities (Tables) Tables http://arbutusbio.com/role/Investmentsinmarketablesecurities 22 false false R23.htm 9955514 - Disclosure - Accounts payable and accrued liabilities (Tables) Sheet http://arbutusbio.com/role/AccountspayableandaccruedliabilitiesTables Accounts payable and accrued liabilities (Tables) Tables http://arbutusbio.com/role/Accountspayableandaccruedliabilities 23 false false R24.htm 9955515 - Disclosure - Sale of future royalties (Tables) Sheet http://arbutusbio.com/role/SaleoffutureroyaltiesTables Sale of future royalties (Tables) Tables http://arbutusbio.com/role/Saleoffutureroyalties 24 false false R25.htm 9955516 - Disclosure - Collaborations, contracts and licensing agreements (Tables) Sheet http://arbutusbio.com/role/CollaborationscontractsandlicensingagreementsTables Collaborations, contracts and licensing agreements (Tables) Tables http://arbutusbio.com/role/Collaborationscontractsandlicensingagreements 25 false false R26.htm 9955517 - Disclosure - Shareholders??? equity (Tables) Sheet http://arbutusbio.com/role/ShareholdersequityTables Shareholders??? equity (Tables) Tables http://arbutusbio.com/role/Shareholdersequity 26 false false R27.htm 9955518 - Disclosure - Segment Reporting (Tables) Sheet http://arbutusbio.com/role/SegmentReportingTables Segment Reporting (Tables) Tables http://arbutusbio.com/role/SegmentReporting 27 false false R28.htm 9955519 - Disclosure - Nature of business and future operations (Details) Sheet http://arbutusbio.com/role/NatureofbusinessandfutureoperationsDetails Nature of business and future operations (Details) Details http://arbutusbio.com/role/Natureofbusinessandfutureoperations 28 false false R29.htm 9955520 - Disclosure - Significant accounting policies (Details) Sheet http://arbutusbio.com/role/SignificantaccountingpoliciesDetails Significant accounting policies (Details) Details http://arbutusbio.com/role/SignificantaccountingpoliciesPolicies 29 false false R30.htm 9955521 - Disclosure - Fair value measurements - Narrative (Details) Sheet http://arbutusbio.com/role/FairvaluemeasurementsNarrativeDetails Fair value measurements - Narrative (Details) Details 30 false false R31.htm 9955522 - Disclosure - Fair value measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Sheet http://arbutusbio.com/role/FairvaluemeasurementsAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails Fair value measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Details 31 false false R32.htm 9955523 - Disclosure - Fair value measurements - Changes in Fair Value of Contingent Consideration (Details) Sheet http://arbutusbio.com/role/FairvaluemeasurementsChangesinFairValueofContingentConsiderationDetails Fair value measurements - Changes in Fair Value of Contingent Consideration (Details) Details 32 false false R33.htm 9955524 - Disclosure - Investments in marketable securities - Marketable Securities (Details) Sheet http://arbutusbio.com/role/InvestmentsinmarketablesecuritiesMarketableSecuritiesDetails Investments in marketable securities - Marketable Securities (Details) Details 33 false false R34.htm 9955525 - Disclosure - Investments in marketable securities - Narrative (Details) Sheet http://arbutusbio.com/role/InvestmentsinmarketablesecuritiesNarrativeDetails Investments in marketable securities - Narrative (Details) Details 34 false false R35.htm 9955526 - Disclosure - Investment in Genevant (Details) Sheet http://arbutusbio.com/role/InvestmentinGenevantDetails Investment in Genevant (Details) Details http://arbutusbio.com/role/InvestmentinGenevant 35 false false R36.htm 9955527 - Disclosure - Accounts payable and accrued liabilities - Schedule of Accounts Payable and Accrued Liabilities (Details) Sheet http://arbutusbio.com/role/AccountspayableandaccruedliabilitiesScheduleofAccountsPayableandAccruedLiabilitiesDetails Accounts payable and accrued liabilities - Schedule of Accounts Payable and Accrued Liabilities (Details) Details 36 false false R37.htm 9955528 - Disclosure - Accounts payable and accrued liabilities - Narrative (Details) Sheet http://arbutusbio.com/role/AccountspayableandaccruedliabilitiesNarrativeDetails Accounts payable and accrued liabilities - Narrative (Details) Details 37 false false R38.htm 9955529 - Disclosure - Sale of future royalties - Narrative (Details) Sheet http://arbutusbio.com/role/SaleoffutureroyaltiesNarrativeDetails Sale of future royalties - Narrative (Details) Details 38 false false R39.htm 9955530 - Disclosure - Sale of future royalties - Liability Activity (Details) Sheet http://arbutusbio.com/role/SaleoffutureroyaltiesLiabilityActivityDetails Sale of future royalties - Liability Activity (Details) Details 39 false false R40.htm 9955531 - Disclosure - Contingencies and commitments (Details) Sheet http://arbutusbio.com/role/ContingenciesandcommitmentsDetails Contingencies and commitments (Details) Details http://arbutusbio.com/role/Contingenciesandcommitments 40 false false R41.htm 9955532 - Disclosure - Collaborations, contracts and licensing agreements (Details) Sheet http://arbutusbio.com/role/CollaborationscontractsandlicensingagreementsDetails Collaborations, contracts and licensing agreements (Details) Details http://arbutusbio.com/role/CollaborationscontractsandlicensingagreementsTables 41 false false R42.htm 9955533 - Disclosure - Collaborations, Contracts and licensing agreements - Licensing Agreements (Details) Sheet http://arbutusbio.com/role/CollaborationsContractsandlicensingagreementsLicensingAgreementsDetails Collaborations, Contracts and licensing agreements - Licensing Agreements (Details) Details 42 false false R43.htm 9955534 - Disclosure - Collaborations, contracts and licensing agreements - Revenue from collaborations (Details) Sheet http://arbutusbio.com/role/CollaborationscontractsandlicensingagreementsRevenuefromcollaborationsDetails Collaborations, contracts and licensing agreements - Revenue from collaborations (Details) Details 43 false false R44.htm 9955535 - Disclosure - Shareholders??? equity - Narrative (Details) Sheet http://arbutusbio.com/role/ShareholdersequityNarrativeDetails Shareholders??? equity - Narrative (Details) Details 44 false false R45.htm 9955536 - Disclosure - Shareholders??? equity - Stock-based Compensation (Details) Sheet http://arbutusbio.com/role/ShareholdersequityStockbasedCompensationDetails Shareholders??? equity - Stock-based Compensation (Details) Details 45 false false R46.htm 9955537 - Disclosure - Segment Reporting (Details) Sheet http://arbutusbio.com/role/SegmentReportingDetails Segment Reporting (Details) Details http://arbutusbio.com/role/SegmentReportingTables 46 false false R47.htm 9955538 - Disclosure - Restructuring (Details) Sheet http://arbutusbio.com/role/RestructuringDetails Restructuring (Details) Details http://arbutusbio.com/role/Restructuring 47 false false All Reports Book All Reports abus-20260331.htm abus-20260331.xsd abus-20260331_cal.xml abus-20260331_def.xml abus-20260331_lab.xml abus-20260331_pre.xml abus-20260331_g1.jpg http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true