3.22.1 html 114 212 1 false 43 0 false 3 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://aligos.com/20220331/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://aligos.com/20220331/taxonomy/role/Role_StatementCONDENSEDCONSOLIDATEDBALANCESHEETS CONDENSED CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 100020 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://aligos.com/20220331/taxonomy/role/Role_StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Sheet http://aligos.com/20220331/taxonomy/role/Role_StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Statements 4 false false R5.htm 100040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Sheet http://aligos.com/20220331/taxonomy/role/StatementCondensedConsolidatedStatementsOfChangesInStockholdersEquity CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Statements 5 false false R6.htm 100050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://aligos.com/20220331/taxonomy/role/Role_StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 6 false false R7.htm 100060 - Disclosure - Organization Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureOrganization Organization Notes 7 false false R8.htm 100070 - Disclosure - Summary of significant accounting policies Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of significant accounting policies Notes 8 false false R9.htm 100080 - Disclosure - Property and equipment Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosurePropertyAndEquipment Property and equipment Notes 9 false false R10.htm 100090 - Disclosure - Investments Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureInvestments Investments Notes 10 false false R11.htm 100100 - Disclosure - Accrued liabilities Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureAccruedLiabilities Accrued liabilities Notes 11 false false R12.htm 100140 - Disclosure - Stock-based compensation Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureStockBasedCompensation Stock-based compensation Notes 12 false false R13.htm 100150 - Disclosure - Fair value Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureFairValue Fair value Notes 13 false false R14.htm 100160 - Disclosure - License and collaboration agreements Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureLicenseAndCollaborationAgreements License and collaboration agreements Notes 14 false false R15.htm 100170 - Disclosure - Commitments and contingencies Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and contingencies Notes 15 false false R16.htm 100180 - Disclosure - Income taxes Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureIncomeTaxes Income taxes Notes 16 false false R17.htm 100190 - Disclosure - Net loss per share Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureNetLossPerShare Net loss per share Notes 17 false false R18.htm 100200 - Disclosure - Discontinued development of drug candidates Sheet http://aligos.com/20220331/taxonomy/role/DisclosureDiscontinuedDevelopmentOfDrugCandidates1 Discontinued development of drug candidates Notes 18 false false R19.htm 100210 - Disclosure - Subsequent events Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureSubsequentEvents Subsequent events Notes 19 false false R20.htm 100220 - Disclosure - Summary of significant accounting policies (Policies) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of significant accounting policies (Policies) Policies 20 false false R21.htm 100240 - Disclosure - Property and equipment (Tables) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosurePropertyAndEquipmentTables Property and equipment (Tables) Tables http://aligos.com/20220331/taxonomy/role/Role_DisclosurePropertyAndEquipment 21 false false R22.htm 100250 - Disclosure - Investments (Tables) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureInvestmentsTables Investments (Tables) Tables http://aligos.com/20220331/taxonomy/role/Role_DisclosureInvestments 22 false false R23.htm 100260 - Disclosure - Accrued liabilities (Tables) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureAccruedLiabilitiesTables Accrued liabilities (Tables) Tables http://aligos.com/20220331/taxonomy/role/Role_DisclosureAccruedLiabilities 23 false false R24.htm 100280 - Disclosure - Stock-based compensation (Tables) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureStockBasedCompensationTables Stock-based compensation (Tables) Tables http://aligos.com/20220331/taxonomy/role/Role_DisclosureStockBasedCompensation 24 false false R25.htm 100290 - Disclosure - Fair value (Tables) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureFairValueTables Fair value (Tables) Tables http://aligos.com/20220331/taxonomy/role/Role_DisclosureFairValue 25 false false R26.htm 100300 - Disclosure - Net loss per share (Tables) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureNetLossPerShareTables Net loss per share (Tables) Tables http://aligos.com/20220331/taxonomy/role/Role_DisclosureNetLossPerShare 26 false false R27.htm 100310 - Disclosure - Organization - Additional Information (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureOrganizationAdditionalInformationDetail Organization - Additional Information (Detail) Details 27 false false R28.htm 100330 - Disclosure - Property and equipment - Summary of Property and Equipment (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosurePropertyAndEquipmentSummaryOfPropertyAndEquipmentDetail Property and equipment - Summary of Property and Equipment (Detail) Details 28 false false R29.htm 100340 - Disclosure - Property and equipment - Additional Information (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosurePropertyAndEquipmentAdditionalInformationDetail Property and equipment - Additional Information (Detail) Details 29 false false R30.htm 100350 - Disclosure - Investments - Summary of Available For Sale Securities Amortized Cost Gross Unrealized Gains Losses and Fair Value (Detail) Sheet http://aligos.com/20220331/taxonomy/role/DisclosureInvestmentsSummaryOfAvailableForSaleSecuritiesAmortizedCostGrossUnrealizedGainsLossesAndFairValueDetail Investments - Summary of Available For Sale Securities Amortized Cost Gross Unrealized Gains Losses and Fair Value (Detail) Details 30 false false R31.htm 100360 - Disclosure - Investments - Summary of Debt Securities Available for Sale Maturity (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureInvestmentsSummaryOfDebtSecuritiesAvailableForSaleMaturityDetail Investments - Summary of Debt Securities Available for Sale Maturity (Detail) Details 31 false false R32.htm 100370 - Disclosure - Investments - Additional Information (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureInvestmentsAdditionalInformationDetail Investments - Additional Information (Detail) Details 32 false false R33.htm 100380 - Disclosure - Accrued liabilities - Summary of Accrued Liabilities (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureAccruedLiabilitiesSummaryOfAccruedLiabilitiesDetail Accrued liabilities - Summary of Accrued Liabilities (Detail) Details 33 false false R34.htm 100430 - Disclosure - Stock-based Compensation - Additional Information (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureStockBasedCompensationAdditionalInformationDetail Stock-based Compensation - Additional Information (Detail) Details 34 false false R35.htm 100440 - Disclosure - Stock-based Compensation - Summary of Stock Options (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfStockOptionsDetail Stock-based Compensation - Summary of Stock Options (Detail) Details 35 false false R36.htm 100450 - Disclosure - Stock-based Compensation - Summary of Stock Based Compensation Expense Was Allocated (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfStockBasedCompensationExpenseWasAllocatedDetail Stock-based Compensation - Summary of Stock Based Compensation Expense Was Allocated (Detail) Details 36 false false R37.htm 100460 - Disclosure - Fair value - Summary of Fair Value of the Financial Instruments that are Measured at Fair Value on a Recurring Basis (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureFairValueSummaryOfFairValueOfFinancialInstrumentsThatAreMeasuredAtFairValueOnRecurringBasisDetail Fair value - Summary of Fair Value of the Financial Instruments that are Measured at Fair Value on a Recurring Basis (Detail) Details 37 false false R38.htm 100470 - Disclosure - License and collaboration agreements - Additional Information (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureLicenseAndCollaborationAgreementsAdditionalInformationDetail License and collaboration agreements - Additional Information (Detail) Details 38 false false R39.htm 100480 - Disclosure - Commitments and contingencies - Additional Information (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and contingencies - Additional Information (Detail) Details 39 false false R40.htm 100490 - Disclosure - Net loss per share - Schedule of Earnings Per Share Basic and Diluted (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureNetLossPerShareScheduleOfEarningsPerShareBasicAndDilutedDetail Net loss per share - Schedule of Earnings Per Share Basic and Diluted (Detail) Details 40 false false R41.htm 100500 - Disclosure - Net loss per share - Schedule of Antidilutive Securities Excluded From Computation of Earnings Per Share (Detail) Sheet http://aligos.com/20220331/taxonomy/role/Role_DisclosureNetLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail Net loss per share - Schedule of Antidilutive Securities Excluded From Computation of Earnings Per Share (Detail) Details 41 false false R42.htm 100510 - Disclosure - Discontinued development of drug candidates - Additional Information (Detail) Sheet http://aligos.com/20220331/taxonomy/role/DisclosureDiscontinuedDevelopmentOfDrugCandidatesAdditionalInformationDetail Discontinued development of drug candidates - Additional Information (Detail) Details 42 false false All Reports Book All Reports algs-20220331.htm algs-20220331.xsd algs-20220331_cal.xml algs-20220331_def.xml algs-20220331_lab.xml algs-20220331_pre.xml algs-ex31_1.htm algs-ex31_2.htm algs-ex32_1.htm algs-ex32_2.htm http://fasb.org/us-gaap/2021-01-31 http://xbrl.sec.gov/dei/2021 true true