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Beneficial ownership Entity incorporation, date of Incorporation Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of Unrecognized Tax Benefits for Uncertain Tax Positions Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Shares Available For Future Grant Under Two Thousand Twenty Four Inducement Equity Incentive Plan [Member] Shares available for future grant under two thousand twenty four inducement equity incentive plan. Shares Available for Future Grant under 2024 Inducement Equity Incentive Plan Payment on achievement of development milestone. Payment On Achievement Of Development Milestone Milestone payments on development milestone achieved Lab Equipment Laboratory equipment. Laboratory Equipment [Member] Contingent Consideration Arrangements [Policy Text Block] Contingent consideration arrangements. Contingent consideration arrangements Other segment expenses Segment Reporting, Other Segment Item, Amount Plan Name [Domain] Plan Name Equity Compensation Income Tax Reconciliation Nondeductible Equity Compensation Income tax reconciliation nondeductible equity compensation. Office Furniture, Fixtures, and Computer Equipment Furniture Fixtures And Computer Equipment [Member] Furniture, fixtures and computer equipment. Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block] Cybersecurity Risk Management Expertise of Management Responsible [Text Block] Description of business. Description Of Business [Table] Description Of Business [Table] Sermonix Pre-funded Warrants [Member] Sermonix pre-funded warrants. 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Milestone Payments Amount Payable Upon Marketing Approval Milestone payments payable upon marketing approval Sermonix Pharmaceuticals Inc [Member] Sermonix Pharmaceuticals Inc. Sermonix Options and restricted stock units forfeited, cancelled, or expired Share-based Compensation Arrangement by Share-based Payment Award, Options and Restricted Stock Units, Forfeited, Cancelled or Expired Share-based compensation arrangement by share-based payment award, options and restricted stock units, forfeited, cancelled or expired. Security Exchange Name Security Exchange Name Property and equipment, at cost Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross Grant income policy. 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Emerging Growth Company Status Policy [Text Block] Emerging Growth Company Status Shares of common stock purchased by each participant Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Purchased for Award Statement of Financial Position [Abstract] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Exercise price two. Exercise Price Two [Member] Exercise Price $10.40 to 42.20 Antidilutive Security, Excluded EPS Calculation [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] 2020 Employee Stock Purchase Plan Tow Thousand And Twenty Employee Stock Purchase Plan [Member] Tow thousand and twenty employee stock purchase plan. Milestone Liability Milestone Liability [Member] Milestone liability. Cybersecurity Risk Management, Strategy, and Governance [Line Items] Liabilities Total liabilities Liabilities Acquired In-process Research and Development Acquired in-process research and development. Acquired in-process research and development Financial Instruments [Domain] Number of authorized shares of capital Capital Units, Authorized Lessee, Operating Lease, Liability, to be Paid, Year Two 2027 Accounting Standards Update 2025-07 [Member] Accounting standards update 2025-07. ASU 2025-07 2020 Equity Incentive Plan Two Thousand And Twenty Equity Incentive Plan [Member] Two thousand and twenty equity incentive plan. Issuance of common stock under employee stock purchase plan, shares Stock Issued During Period, Shares, Employee Stock Ownership Plan, shares Weighted Average Number of Shares Outstanding, Diluted, Total Weighted Average Number of Shares Outstanding, Diluted Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted Asset Acquisitions [Policy Text Block] Asset acquisitions. Asset acquisitions Securities Act File Number Entity File Number Phase two clinical trail initiation of license agreement. 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Sermonix License Deferred Tax Assets, Other Other Shares Issuable Upon the Exercise of Outstanding Common Stock Options and the Vesting of Outstanding Common Restricted Stock Units Granted Shares Issuable Upon The Exercise Of Outstanding Common Stock Options and the Vesting of Outstanding Common Restricted Stock Units Granted Member Shares issuable upon the exercise of outstanding common stock options and the vesting of outstanding common restricted stock units granted. Milestone Liability Milestone liability Milestone liability Consideration of asset acquired Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Weighted-Average Exercise price per Share, Expected to vest Property and equipment useful life Property, Plant and Equipment, Useful Life New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Reconciliation of Undiscounted Operating Lease Cash Flows to Operating Lease Liability Payments Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Summary of Restricted Stock Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Non-deductible expenses and others/ Nontaxable or Nondeductible Items Non-deductible expenses and others Income (Loss) from Continuing Operations before Income Taxes, Domestic United States Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Depreciation, Total Depreciation Depreciation expense Warrants [Policy Text Block] Warrants. Warrants Series A Common Warrants [Member] Series A Common Warrants member. Series A Common Warrants Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Unrecognized compensation cost Lessee, Operating Lease, Term of Contract Operating lease initial term Sermonix Pre-funded Warrant Sermonix pre-funded warrant. 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Fosgonimeton (ATH-1017) Earnings Per Share [Text Block] Net Loss Per Share Attributable to Common Stockholders Measurement Input, Expected Dividend Rate [Member] Dividend Yield Cybersecurity Risk Management Processes Integrated [Text Block] Net loss Net loss Aggregate Intrinsic Value, Outstanding Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Aggregate Intrinsic Value, Ending Balance Aggregate Intrinsic Value, Beginning Balance Commercialization Milestones Payments Commercialization milestones payments. 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Other Liabilities, Noncurrent Other long-term liabilities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Property, Plant and Equipment [Table Text Block] Schedule of Property and Equipment Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-Average Exercise price per Share, Ending Balance Weighted-Average Exercise price per Share, Beginning Balance Cash and cash equivalents accumulated gross unrealized gain before tax. Cash And Cash Equivalents Accumulated Gross Unrealized Gain Before Tax Cash equivalents, Unrealized Gains Income Tax Disclosure [Abstract] Unrecognized Tax Benefits Ending balance Beginning balance Additional Paid-in Capital [Member] Additional Paid-In Capital Grants received. 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Milestone Payments Amount Payable Upon Trial Initiation Milestone payments, amount payable Maximum [Member] Maximum Liabilities, Fair Value Disclosure Liabilities, Fair Value Disclosure Total liabilities subject to fair value measurements on a recurring basis Statistical Measurement [Axis] Statistical Measurement Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted-Average Exercise price per Share, Exercised Washington state university license agreement. 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Summary of Option Activity Changes in Shares Available for Grant under the 2020 Plan and the 2024 Inducement Plan Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items] Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] Entity Public Float Entity Public Float Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected volatility Costs and Expenses Total operating expenses Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Employee Stock [Member] Employee Stock Purchase Plan Employee Stock Purchase Plan General and administrative expenses General and Administrative Expense (Excluding Stockbased or Depreciation Expense) General and administrative expense (excluding stockbased or depreciation expense). Net sales exempt from royalty payment. 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Termination Benefits Proceeds from Issuance of Common Stock Proceeds from issuance of common stock Proceeds from PIPE financing Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Schedule of Fair Value Sermonix Pre-funded Warrant And Milestone Liability At Issuance Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Liability Class [Axis] Net operating loss and tax credit carryforwards, expiration period. 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First milestone payment Litigation Case [Axis] Weighted average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Segment Reporting Information [Line Items] Stockholders' Equity Note, Stock Split, Conversion Ratio Reverse stock split ratio ATH-1020 [Member] ATH-1020. ATH-1020 Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Cash, cash equivalents and restricted cash Corporate Bonds Corporate Bond Securities [Member] Operating Income (Loss) Loss from operations Loss from operations Series B Common Warrants [Member] Series B Common Warrants member. Series B Common Warrants Retained Earnings [Member] Accumulated Deficit Share based compensation maximum annual increase in number of shares that may be issued under the plan Share Based Compensation Maximum Annual Increase In Number Of Shares That May Be Issued Under Plan Share based compensation maximum annual increase in number of shares that may be issued under the plan. Cash and Cash Equivalents [Axis] Share-based Payment Arrangement, Noncash Expense, Total Share-Based Payment Arrangement, Noncash Expense Stock-based compensation Assets acquired transaction Asset Acquisition, Consideration Transferred Consideration paid Consideration paid Measurement Input, Price Volatility [Member] Volatility Payments of Stock Issuance Costs Issuance costs from PIPE financing Sermonix Pre-Funded Warrant Pre Funded Warrant Prefunded warrant. Sermonix Pre Funded Warrant [Member] Sermonix Pre-Funded Warrant Sermonix pre funded warrant. Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Liability, Noncurrent Operating lease liability, less current portion Fair Value, Inputs, Level 1 [Member] Level 1 Class of Stock [Line Items] Class Of Stock [Line Items] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by financing activities Schedule of assets acquired Asset Acquisition [Table Text Block] Lease, Cost [Table Text Block] Weighted Average Remaining Lease Term and Weighted Average Discount Rate and Operating Lease Expense and Variable Lease Expense Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Change in accounting principle, accounting standards update, adopted Asset Acquisition [Abstract] Auditor Location Personnel-related costs, excluding stock- based compensation [Member] Personnel-related costs, excluding stock- based compensation. Personnel-Related Costs, Excluding Stock- Based Compensation Name of plaintiff Loss Contingency, Name of Plaintiff Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Summary of Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders Estimated Litigation Liability Legal settlement expense Litigation related accruals Income Tax Jurisdiction [Domain] Income Tax Authority Entity Interactive Data Current Entity Interactive Data Current Deferred Tax Liabilities, Gross [Abstract] Deferred tax liabilities: Statement of Income Location, Balance [Domain] Income Statement Location At The Market Offering. At The Market Offering [Member] At The Market Common Stock Offering Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Operating activities Asset Acquisition [Line Items] Accrued legal settlement Loss Contingency, Accrual, Current Accrued legal settlement (Note 7) Accretion (Amortization) of Discounts and Premiums, Investments Amortization of premiums and accretion of discounts on available-for-sale securities, net Estimated fair value warrant Estimated Fair Value Warrant Estimated fair value warrant. Proceeds from exercise of common stock options and issuance of common stock under employee stock purchase plan. Proceeds from Exercise of Common Stock Options and Issuance of Common Stock Under Employee Stock Purchase Plan Proceeds from exercise of common stock options and issuance of common stock under employee stock purchase plan. Increase (Decrease) in Other Noncurrent Liabilities Other long-term liabilities Short-term Investments Short-term Investments, Policy [Policy Text Block] Short-term investments. Entity Tax Identification Number Entity Tax Identification Number Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies line items. Maturities of available-for-sale securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Local Phone Number Local Phone Number Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Unrecognized compensation cost Auditor Opinion [Text Block] Schedule of cash, cash equivalents and restricted cash. Schedule Of Cash, Cash Equivalents and Restricted Cash [Table Text Block] Schedule of Cash, Cash Equivalents and Restricted Cash Accounting Policies [Abstract] Cash, cash equivalents, and investments Investments and Cash Investments and Cash, Total Two Thousand Twenty Five PIPE Financing [Member] Two thousand twenty five pipe financing. 2025 PIPE Financing Insurance recovery related to legal settlement Insurance recovery related to legal settlement Insurance recovery in operating expenses Insurance Recoveries Exercise price one. Exercise Price One [Member] Exercise Price $3.13 to 7.14 Shares Available for Future Grant under 2020 Equity Incentive Plan Shares available for future grant under the 2020 equity incentive plan. Shares Available For Future Grant Under Two Thousand Twenty Equity Incentive Plan [Member] Commercial Paper [Member] Commercial Paper Jawandha V. Athira Pharma Inc., Jawandha V Athira Pharma Inc [Member] Jawandha V. Athira Pharma Inc. Shares Available for Grant, Ending Balance Shares Available for Grant, Beginning Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Common stock available for future grants Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Remaining weighted-average period expected to recognize unrecognized compensation cost Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Percentage of pretax compensation eligible to defer Stock, Class of Stock [Table] Schedule Of Stock By Class [Table] Entity Emerging Growth Company Entity Emerging Growth Company Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Weighted-Average Remaining Contractual Term, Expected to vest (in years)