3.26.1 html 297 441 1 false 103 0 false 8 false false R1.htm 75000 - Document - Document and Entity Information Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 75010 - Statement - Consolidated Balance Sheets Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 75020 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 75030 - Statement - Consolidated Statements of Loss and Comprehensive Loss Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_StatementConsolidatedStatementsOfLossAndComprehensiveLoss Consolidated Statements of Loss and Comprehensive Loss Statements 4 false false R5.htm 75050 - Statement - Consolidated Statements of Stockholder's Equity Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_StatementConsolidatedStatementsOfStockholderSEquity Consolidated Statements of Stockholder's Equity Statements 5 false false R6.htm 75060 - Statement - Consolidated Statements of Cash Flows Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 6 false false R7.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 7 false false R8.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 8 false false R9.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 9 false false R10.htm 995457 - Disclosure - Cybersecurity Risk Management, Strategy, and Governance Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance Cybersecurity Risk Management, Strategy, and Governance Notes 10 false false R11.htm 995467 - Disclosure - Nature of Business, Basis of Presentation and Liquidity Risk Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureNatureOfBusinessBasisOfPresentationAndLiquidityRisk Nature of Business, Basis of Presentation and Liquidity Risk Notes 11 false false R12.htm 995477 - Disclosure - Accounting Policies Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureAccountingPolicies Accounting Policies Notes 12 false false R13.htm 995487 - Disclosure - Financial Instruments and Risk Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureFinancialInstrumentsAndRisk Financial Instruments and Risk Notes 13 false false R14.htm 995507 - Disclosure - Intangibles Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIntangibles Intangibles Notes 14 false false R15.htm 995517 - Disclosure - License Agreements Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureLicenseAgreements License Agreements Notes 15 false false R16.htm 995527 - Disclosure - Fair Value Measurements Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurements Fair Value Measurements Notes 16 false false R17.htm 995537 - Disclosure - Property and Equipment Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosurePropertyAndEquipment Property and Equipment Notes 17 false false R18.htm 995547 - Disclosure - Convertible Debt Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureConvertibleDebt Convertible Debt Notes 18 false false R19.htm 995557 - Disclosure - Income Tax Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTax Income Tax Notes 19 false false R20.htm 995567 - Disclosure - Common Stock Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStock Common Stock Notes 20 false false R21.htm 995577 - Disclosure - Related Party Transactions Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 21 false false R22.htm 995587 - Disclosure - Commitments and Contingencies Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 22 false false R23.htm 995607 - Disclosure - Accounting Policies (Policies) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureAccountingPoliciesPolicies Accounting Policies (Policies) Policies http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureAccountingPolicies 23 false false R24.htm 995617 - Disclosure - Accounting Policies (Tables) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureAccountingPoliciesTables Accounting Policies (Tables) Tables http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureAccountingPolicies 24 false false R25.htm 995627 - Disclosure - Intangibles (Tables) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIntangiblesTables Intangibles (Tables) Tables http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIntangibles 25 false false R26.htm 995637 - Disclosure - Fair Value Measurements (Tables) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurements 26 false false R27.htm 995647 - Disclosure - Property and Equipment (Tables) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosurePropertyAndEquipmentTables Property and Equipment (Tables) Tables http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosurePropertyAndEquipment 27 false false R28.htm 995657 - Disclosure - Convertible Debt (Tables) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureConvertibleDebtTables Convertible Debt (Tables) Tables http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureConvertibleDebt 28 false false R29.htm 995667 - Disclosure - Income Tax (Tables) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxTables Income Tax (Tables) Tables http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTax 29 false false R30.htm 995677 - Disclosure - Common Stock (Tables) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockTables Common Stock (Tables) Tables http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStock 30 false false R31.htm 995687 - Disclosure - Commitments and Contingencies (Tables) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies 31 false false R32.htm 995697 - Disclosure - Nature of Business, Basis of Presentation and Liquidity Risk - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureNatureOfBusinessBasisOfPresentationAndLiquidityRiskAdditionalInformationDetail Nature of Business, Basis of Presentation and Liquidity Risk - Additional Information (Detail) Details 32 false false R33.htm 995707 - Disclosure - Accounting Policies - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureAccountingPoliciesAdditionalInformationDetail Accounting Policies - Additional Information (Detail) Details 33 false false R34.htm 995717 - Disclosure - Accounting Policies - Summary of Depreciation on Property and Equipment (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureAccountingPoliciesSummaryOfDepreciationOnPropertyAndEquipmentDetail Accounting Policies - Summary of Depreciation on Property and Equipment (Detail) Details 34 false false R35.htm 995727 - Disclosure - Financial Instruments and Risk - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureFinancialInstrumentsAndRiskAdditionalInformationDetail Financial Instruments and Risk - Additional Information (Detail) Details 35 false false R36.htm 995747 - Disclosure - Intangibles - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIntangiblesAdditionalInformationDetail Intangibles - Additional Information (Detail) Details 36 false false R37.htm 995757 - Disclosure - Intangibles - Components of Intangible Assets (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIntangiblesComponentsOfIntangibleAssetsDetail Intangibles - Components of Intangible Assets (Detail) Details 37 false false R38.htm 995767 - Disclosure - Intangibles - Estimated Future Amortization Expense Related to Intangible Assets (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIntangiblesEstimatedFutureAmortizationExpenseRelatedToIntangibleAssetsDetail Intangibles - Estimated Future Amortization Expense Related to Intangible Assets (Detail) Details 38 false false R39.htm 995777 - Disclosure - License Agreements - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureLicenseAgreementsAdditionalInformationDetail License Agreements - Additional Information (Detail) Details 39 false false R40.htm 995787 - Disclosure - Fair Value Measurements - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsAdditionalInformationDetail Fair Value Measurements - Additional Information (Detail) Details 40 false false R41.htm 995797 - Disclosure - Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsSummaryOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Details 41 false false R42.htm 995807 - Disclosure - Fair Value Measurements - Summary of Cash, Cash Equivalents and Restricted Cash (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureFairValueMeasurementsSummaryOfCashCashEquivalentsAndRestrictedCashDetail Fair Value Measurements - Summary of Cash, Cash Equivalents and Restricted Cash (Detail) Details 42 false false R43.htm 995817 - Disclosure - Fair Value Measurements - Schedule of Corporate Bonds and Commercial Paper (Details) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureFairValueMeasurementsScheduleOfCorporateBondsAndCommercialPaperDetails Fair Value Measurements - Schedule of Corporate Bonds and Commercial Paper (Details) Details 43 false false R44.htm 995827 - Disclosure - Fair Value Measurements - Schedule of Aggregate Fair Value of Principal Amount of Convertible Debt (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsScheduleOfAggregateFairValueOfPrincipalAmountOfConvertibleDebtDetail Fair Value Measurements - Schedule of Aggregate Fair Value of Principal Amount of Convertible Debt (Detail) Details 44 false false R45.htm 995837 - Disclosure - Fair Value Measurements - Schedule of Changes in Fair Value of Level 3 Financial Liabilities (Details) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureFairValueMeasurementsScheduleOfChangesInFairValueOfLevel3FinancialLiabilitiesDetails Fair Value Measurements - Schedule of Changes in Fair Value of Level 3 Financial Liabilities (Details) Details 45 false false R46.htm 995847 - Disclosure - Property and Equipment - Summary of Property and Equipment (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosurePropertyAndEquipmentSummaryOfPropertyAndEquipmentDetail Property and Equipment - Summary of Property and Equipment (Detail) Details 46 false false R47.htm 995857 - Disclosure - Convertible Debt - Additional Information (Details) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureConvertibleDebtAdditionalInformationDetails Convertible Debt - Additional Information (Details) Details 47 false false R48.htm 995867 - Disclosure - Convertible Debt - Schedule of Convertible Term Loan Balance Including Convertible Debt Balance (Details) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureConvertibleDebtScheduleOfConvertibleTermLoanBalanceIncludingConvertibleDebtBalanceDetails Convertible Debt - Schedule of Convertible Term Loan Balance Including Convertible Debt Balance (Details) Details 48 false false R49.htm 995877 - Disclosure - Income Tax - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxAdditionalInformationDetail Income Tax - Additional Information (Detail) Details 49 false false R50.htm 995887 - Disclosure - Income Tax - Summary of U.S. and Foreign Components of Income (Loss) before Income Taxes (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxSummaryOfUSAndForeignComponentsOfIncomeLossBeforeIncomeTaxesDetail Income Tax - Summary of U.S. and Foreign Components of Income (Loss) before Income Taxes (Detail) Details 50 false false R51.htm 995897 - Disclosure - Income Tax - Reconciliation of Income Tax Attributable to Operations (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxReconciliationOfIncomeTaxAttributableToOperationsDetail Income Tax - Reconciliation of Income Tax Attributable to Operations (Detail) Details 51 false false R52.htm 995907 - Disclosure - Income Tax - Summary of Tax Effects of Temporary Differences and Carryforwards Rise to Deferred Tax Assets and Liabilities (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxSummaryOfTaxEffectsOfTemporaryDifferencesAndCarryforwardsRiseToDeferredTaxAssetsAndLiabilitiesDetail Income Tax - Summary of Tax Effects of Temporary Differences and Carryforwards Rise to Deferred Tax Assets and Liabilities (Detail) Details 52 false false R53.htm 995917 - Disclosure - Income Tax - Summary of Components of Cash Income Taxes Paid Net of Refunds (Details) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureIncomeTaxSummaryOfComponentsOfCashIncomeTaxesPaidNetOfRefundsDetails Income Tax - Summary of Components of Cash Income Taxes Paid Net of Refunds (Details) Details 53 false false R54.htm 995927 - Disclosure - Income Tax - Reconciliation of Unrecognized Tax Benefits of Uncertain Tax Positions (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxReconciliationOfUnrecognizedTaxBenefitsOfUncertainTaxPositionsDetail Income Tax - Reconciliation of Unrecognized Tax Benefits of Uncertain Tax Positions (Detail) Details 54 false false R55.htm 995937 - Disclosure - Income Tax - Summary of Years Open to Examination under Different Jurisdiction (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxSummaryOfYearsOpenToExaminationUnderDifferentJurisdictionDetail Income Tax - Summary of Years Open to Examination under Different Jurisdiction (Detail) Details 55 false false R56.htm 995947 - Disclosure - Common Stock - Authorized - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockAuthorizedAdditionalInformationDetail Common Stock - Authorized - Additional Information (Detail) Details 56 false false R57.htm 995957 - Disclosure - Common Stock - Issued and Outstanding Shares - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockIssuedAndOutstandingSharesAdditionalInformationDetail Common Stock - Issued and Outstanding Shares - Additional Information (Detail) Details 57 false false R58.htm 995967 - Disclosure - Common Stock - Open Market Sale Agreement - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureCommonStockOpenMarketSaleAgreementAdditionalInformationDetail Common Stock - Open Market Sale Agreement - Additional Information (Detail) Details 58 false false R59.htm 995977 - Disclosure - Common Stock- Public Offering - Additional Information (Details) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureCommonStockPublicOfferingAdditionalInformationDetails Common Stock- Public Offering - Additional Information (Details) Details 59 false false R60.htm 995987 - Disclosure - Common Stock - Equity Awards - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureCommonStockEquityAwardsAdditionalInformationDetail Common Stock - Equity Awards - Additional Information (Detail) Details 60 false false R61.htm 995997 - Disclosure - Common Stock - Summary of Fair Value of Option Awards (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockSummaryOfFairValueOfOptionAwardsDetail Common Stock - Summary of Fair Value of Option Awards (Detail) Details 61 false false R62.htm 996007 - Disclosure - Common Stock - Summary of Stock-Based Compensation Expense (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureCommonStockSummaryOfStockbasedCompensationExpenseDetail Common Stock - Summary of Stock-Based Compensation Expense (Detail) Details 62 false false R63.htm 996017 - Disclosure - Common Stock - Summary of Stock Options Activity (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockSummaryOfStockOptionsActivityDetail Common Stock - Summary of Stock Options Activity (Detail) Details 63 false false R64.htm 996027 - Disclosure - Common Stock - Summary of Stock Options Outstanding Regarding Number of Common Shares Issuable upon Exercise of Outstanding Options (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockSummaryOfStockOptionsOutstandingRegardingNumberOfCommonSharesIssuableUponExerciseOfOutstandingOptionsDetail Common Stock - Summary of Stock Options Outstanding Regarding Number of Common Shares Issuable upon Exercise of Outstanding Options (Detail) Details 64 false false R65.htm 996037 - Disclosure - Common Stock - Summary of Stock Options Outstanding Regarding Number of Common Shares Issuable upon Exercise of Vested Options (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockSummaryOfStockOptionsOutstandingRegardingNumberOfCommonSharesIssuableUponExerciseOfVestedOptionsDetail Common Stock - Summary of Stock Options Outstanding Regarding Number of Common Shares Issuable upon Exercise of Vested Options (Detail) Details 65 false false R66.htm 996047 - Disclosure - Common Stock - Restricted Stock Unit Awards - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockRestrictedStockUnitAwardsAdditionalInformationDetail Common Stock - Restricted Stock Unit Awards - Additional Information (Detail) Details 66 false false R67.htm 996057 - Disclosure - Common Stock - Summary of Restricted Stock Unit Award Activity (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockSummaryOfRestrictedStockUnitAwardActivityDetail Common Stock - Summary of Restricted Stock Unit Award Activity (Detail) Details 67 false false R68.htm 996067 - Disclosure - Common Stock - Employee Stock Purchase Plan - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureCommonStockEmployeeStockPurchasePlanAdditionalInformationDetail Common Stock - Employee Stock Purchase Plan - Additional Information (Detail) Details 68 false false R69.htm 996077 - Disclosure - Common Stock - Summary of Outstanding Warrants (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockSummaryOfOutstandingWarrantsDetail Common Stock - Summary of Outstanding Warrants (Detail) Details 69 false false R70.htm 996087 - Disclosure - Common Stock - Stock Warrants - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockStockWarrantsAdditionalInformationDetail Common Stock - Stock Warrants - Additional Information (Detail) Details 70 false false R71.htm 996097 - Disclosure - Common Stock - Computation of Basic and Diluted Net Loss Attributable to Common Shareholders Per Share (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockComputationOfBasicAndDilutedNetLossAttributableToCommonShareholdersPerShareDetail Common Stock - Computation of Basic and Diluted Net Loss Attributable to Common Shareholders Per Share (Detail) Details 71 false false R72.htm 996107 - Disclosure - Common Stock - Loss Per Common Share - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommonStockLossPerCommonShareAdditionalInformationDetail Common Stock - Loss Per Common Share - Additional Information (Detail) Details 72 false false R73.htm 996117 - Disclosure - Related Party Transactions (Additional Information) (Details) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails Related Party Transactions (Additional Information) (Details) Details http://ir.achievelifesciences.com/20251231/taxonomy/role/DisclosureRelatedPartyTransactions 73 false false R74.htm 996127 - Disclosure - Commitments and Contingencies - Summary of Contractual Obligations (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesSummaryOfContractualObligationsDetail Commitments and Contingencies - Summary of Contractual Obligations (Detail) Details 74 false false R75.htm 996137 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 75 false false R76.htm 996147 - Disclosure - Commitments and Contingencies - Summary of Future Minimum Annual Lease Payments (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesSummaryOfFutureMinimumAnnualLeasePaymentsDetail Commitments and Contingencies - Summary of Future Minimum Annual Lease Payments (Detail) Details 76 false false R77.htm 996157 - Disclosure - Commitments and Contingencies - Summary of Other Information Related to Leases (Detail) Sheet http://ir.achievelifesciences.com/20251231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesSummaryOfOtherInformationRelatedToLeasesDetail Commitments and Contingencies - Summary of Other Information Related to Leases (Detail) Details 77 false false All Reports Book All Reports achv-20251231.htm achv-20251231.xsd http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 false false