Entity Address, City or Town Entity Address, City or Town Deferred Tax Liabilities, Net [Abstract] Deferred tax liability: Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Fair Value Disclosures [Abstract] Earnings Per Share [Abstract] Fair Value, Inputs, Level 1 [Member] Level 1 Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Domestic Tax Authority [Member] United States Vesting Of Early Exercised Stock Options And Restricted Stock Vesting Of Early Exercised Stock Options And Restricted Stock Vesting of early exercised stock options Stock Issued During Period, Value, New Issues Issuance of common stock for cash, net of issuance cost Research and Development Expense, Policy [Policy Text Block] Research and Development Expense and Accrued Research and Development Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net increase in cash and cash equivalents Warrant notice period Sale Of Stock Warrant Covenants Notice Period Sale of stock, warrant covenants, notice period. Assumed dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Dividends Amendment Flag Amendment Flag Non-cash investing activities: Additional Cash Flow Elements, Investing Activities [Abstract] Assumed in reverse recapitalization (in dollars per share) ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsassumedInReverseRecapitalizationInPeriodWeightedAverageExercisePrice ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsassumedInReverseRecapitalizationInPeriodWeightedAverageExercisePrice ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsassumedInReverseRecapitalizationInPeriodWeightedAverageExercisePrice Subsequent Event Type [Domain] Subsequent Event Type [Domain] Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Amortization Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Amortization Amortization Deferred Tax Assets, Operating Loss Carryforwards, State and Local Operating loss carryforwards, state Schedule of Long-Term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Share-Based Payment Arrangement, Employee [Member] Share-based Payment Arrangement, Employee Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: imputed interest Earnings Per Share, Policy [Policy Text Block] Net Loss Per Share Attributable to Common Stockholders Reverse recapitalization transaction costs Adjustments To Additional Paid In Capital Reverse Recapitalization Transaction Costs Adjustments to Additional Paid in Capital, Reverse Recapitalization Transaction Costs Statement [Table] Statement [Table] Noncurrent operating lease obligations Operating lease liabilities, less current portion Operating Lease, Liability, Noncurrent Number of operating segments Number of Operating Segments Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Business Acquisition [Axis] Business Acquisition [Axis] Common stock, capital shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Auditor Firm ID Auditor Firm ID Beneficial ownership percentage after issuing notice Sale Of Stock Warrant Covenants Maximum Ownership Percentage After Issuing Notice Sale of stock, warrant covenants, maximum ownership percentage after issuing notice. Business Combination Disclosure [Text Block] Millendo Merger Income Tax Authority [Domain] Income Tax Authority [Domain] Income Tax [Table] Income Tax [Table] Employee-related Liabilities, Current, Total Employee-related Liabilities, Current Accrued compensation Share-Based Payment Arrangement, Option [Member] Options to purchase common stock Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Net Carrying Value Total liabilities and stockholders' equity Liabilities and Equity Tax Period [Axis] Tax Period [Axis] Plan Name [Domain] Plan Name [Domain] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Denominator: Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Income Statement [Abstract] Share-based compensation arrangement by share-based payment award, period of automatic increase to outstanding stock maximum Share-based Compensation Arrangement by Share-based Payment Award, Period of Automatic Increase to Outstanding Stock Maximum Share-based Compensation Arrangement by Share-based Payment Award, Period of Automatic Increase to Outstanding Stock Maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Stockholders' Equity, Reverse Stock Split Reverse stock split Tranche C Term Loan Tranche C Term Loan [Member] Tranche C term loan. Organization and Description of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Sale of Stock [Domain] Sale of Stock [Domain] Liabilities, Current Total current liabilities 2025 Lessee, Operating Lease, Liability, to be Paid, Year Three Noncash interest and other expense, net Noncash interest and other expense, net Noncash interest and other expense, net Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Fair Value, Recurring [Member] Fair Value, Recurring Interest Expense, Total Interest Expense Interest expense Patent Costs, Policy Patent Costs, Policy [Policy Text Block] Patent Costs Income Tax, Policy [Policy Text Block] Income Taxes Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] Summary of Information About Stock Options Outstanding Preferred stock, shares authorized Preferred Stock, Shares Authorized BusinessCombinationExchangeRatio BusinessCombinationExchangeRatio Share exchange ratio Private Tempest Private Tempest [Member] Private Tempest. Amount covered by insurance Litigation Expense Amount Covered By Insurance Litigation Expense Amount Covered By Insurance Litigation expense covered by insurance Debt Instrument, Number of Tranches Debt Instrument, Number of Tranches Number of tranches Entity Small Business Entity Small Business Pre-funded warrant price (in dollars per share) Sale Of Stock Exercise Price Of Warrants Or Right Sale of stock exercise price of warrants or right. Number of reportable segments Number of Reportable Segments Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Payments of Loan Costs Payment of loan issuance costs Prepaid Research and Development Costs, Current Prepaid Research and Development Costs, Current Prepaid research and development costs Assets, Current Total current assets Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds Net of Issuance Cost Proceeds from issuance of redeemable convertible preferred stock Weighted-average shares of common stock and pre-funded warrants outstanding, basic Weighted-average shares used in computing basic net loss per share Weighted Average Number of Shares Outstanding, Basic City Area Code City Area Code Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Cancelled and forfeited (in shares) Cancelled and forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Share-Based Payment Arrangement [Abstract] Liabilities Total liabilities Document Period End Date Document Period End Date Share-based compensation arrangement by share-based payment award, percentage of outstanding stock maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum Business Combination and Asset Acquisition [Abstract] Share-Based Payment Arrangement, Nonemployee [Member] Share-based Payment Arrangement, Nonemployee Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Stock based compensation Schedule of Estimated Useful Lives of Property, Plant and Equipment Schedule of estimated useful lives of property, plant and equipment Schedule of estimated useful lives of property, plant and equipment [Policy Text Block] Statistical Measurement [Axis] Statistical Measurement [Axis] Other Assets, Current Other current assets Assets Total assets State and Local Jurisdiction [Member] State and Local Jurisdiction Loan payable (net of discount and issuance costs of $454 and $756, respectively) Long-Term Debt, Excluding Current Maturities, Total Long-Term Debt, Excluding Current Maturities Net loss per share of common stock and pre-funded warrants, diluted Net loss per share attributable to common stockholders - diluted Earnings Per Share, Diluted, Total Earnings Per Share, Diluted Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Debt Instrument, Unamortized Discount, Noncurrent Loan discounts Entity Address, Postal Zip Code Entity Address, Postal Zip Code Prepayment amount Payment for Debt Extinguishment or Debt Prepayment Cost Document Fiscal Period Focus Document Fiscal Period Focus Office Equipment [Member] Laboratory equipment Deferred Tax Assets, Valuation Allowance Valuation allowance Less: valuation allowance Counterparty Name [Domain] Counterparty Name [Domain] Operating Lease, Liability Present value of operating lease obligations Present value of operating lease obligations Net Cash Provided by (Used in) Financing Activities Cash provided by financing activities Deferred Tax Liabilities, Property, Plant and Equipment Fixed assets Schedule of Prepaid Expenses and Other Current Asset Schedule Of Prepaid Expenses And Other Current Asset Schedule Of Prepaid Expenses And Other Current Asset [Table Text Block] Statement of Financial Position [Abstract] Temporary Equity, Shares Issued Temporary Equity, Shares Issued Shares Issued Securities Act File Number Entity File Number Stock Issued During Period, Shares, Conversion of Units Conversion of preferred stock to common stock (in shares) Statement of Cash Flows [Abstract] Cash acquired in connection with reverse recapitalization Proceeds From Cash Acquired in Connection With Reverse Recapitalization Proceeds From Cash Acquired in Connection With Reverse Recapitalization 2028 and beyond Lessee, Operating Lease, Liability, to be Paid, after Year Five Retirement Plan Retirement Benefits [Text Block] Geographical [Domain] Statement Geographical Axis [Domain] Statistical Measurement [Domain] Statistical Measurement [Domain] Statement of Stockholders' Equity [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] Share-based compensation arrangement by share-based payment award, purchase price of common stock, percent Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Auditor Location Auditor Location StockholdersEquityNoteStockSplitExchangeRatio StockholdersEquityNoteStockSplitExchangeRatio Stock split exchange ratio Class of Stock [Domain] Class of Stock [Domain] Legal Entity [Axis] Legal Entity [Axis] Fair Value Disclosures [Text Block] Fair Value Measurements Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Proceeds from option exercises Proceeds from Stock Options Exercised Proceeds from the issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Jefferies LLC Jefferies LLC [Member] Jefferies LLC Long-Term Debt, Type [Axis] Long-term Debt, Type [Axis] Grantee Status [Axis] Grantee Status [Axis] Deferred Tax Assets, Tax Credit Carryforwards, Research Research and development tax credits Summary of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Temporary Equity [Table Text Block] Summary of Convertible Preferred Stock Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Antidilutive Securities [Axis] Antidilutive Securities [Axis] Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Preferred stock, par or stated value per share Preferred Stock, Par or Stated Value Per Share Convertible preferred stock, par value (in dollars per share) Supplemental Balance Sheet Disclosures [Text Block] Balance Sheet Items Credit Facility [Domain] Weighted-average shares of common stock and pre-funded warrants outstanding, diluted Weighted-average shares used in computing diluted net loss per share Weighted-average shares used in computing diluted net loss per share Weighted Average Number of Shares Outstanding, Diluted Noncash lease expense Noncash lease expense Noncash lease expense Conversion of Preferred Stock into a Share of Common Stock Conversion Of Preferred Stock Into A Share Of Common Stock [Member] Conversion of preferred stock into a share of common stock. Insurance Settlements Receivable Insurance recovery of legal settlement Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount State taxes Credit Facility [Axis] Computer Equipment [Member] Computer equipment and software General and Administrative Expense [Member] General and Administrative Expense Share-based payment arrangement, nonvested award, option, cost not yet recognized, amount Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Current Fiscal Year End Date Current Fiscal Year End Date At-The-Market Program At-The-Market Program [Member] At-The-Market Program Depreciation, Total Depreciation Depreciation expense Tranche A Term Loan Tranche A Term Loan [Member] Tranche A term loan. Other Assets, Noncurrent Other noncurrent assets Total stockholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Entity Address, Address Line One Entity Address, Address Line One Not Subject to Expiration Not Subject to Expiration [Member] Not Subject to Expiration Document Annual Report Document Annual Report Vesting of early exercise stock options Vesting of early exercise stock options Vesting of early exercise stock options Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information: Expiration date Lease Expiration Date Beneficial ownership percentage Sale Of Stock Warrant Covenants Maximum Ownership Percentage Sale of stock, warrant covenants, maximum ownership percentage. Income Tax Expense (Benefit) Provision for income taxes Total Increase (Decrease) in Operating Lease Liability Operating lease liabilities Less: Weighted-average unvested restricted shares and shares subject to repurchase Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation Less: Weighted-average unvested restricted shares and shares subject to repurchase Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Valuation allowance Income Tax Disclosure [Text Block] Income Taxes Preferred stock, shares issued Preferred Stock, Shares Issued Other Accrued Liabilities, Current Accrued other liabilities Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Income Tax Disclosure [Abstract] Increase (Decrease) in Interest Payable, Net Interest payable Warrant issuance costs Warrant Issuance Costs Warrant issuance costs. Issuance of common stock for cash (in shares) Stock Issued During Period, Shares, New Issues Issuance of common stock for cash, net of issuance cost (in shares) Legal settlement Litigation Settlement Litigation settlement. Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Share-Based Payment Arrangement [Policy Text Block] Share-based Compensation Expense Auditor Name Auditor Name Common Stock Shares Subject To Repurchase Shares Common Stock Shares Subject To Repurchase Shares Common stock shares subject to repurchase shares Tranche B Term Loan Tranche B Term Loan [Member] Tranche B term loan. Equity [Abstract] Pre-funded warrant price (in dollars per share) Sale Of Stock Exercise Price Of Warrants Or Rights Sale of stock, exercise price of warrants or rights. Selling, General and Administrative Expenses, Policy [Policy Text Block] General and Administrative Expenses Cancelled and forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Operating Income (Loss) Loss from operations Common stock warrants Common Stock Warrants [Member] Common stock warrants. Share-based compensation arrangement by share-based payment award, shares issued in period Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Weighted Average Number of Shares Issued, Basic Weighted-average common shares outstanding 2019 and 2017 Equity Incentive Plan A2019 And2017 Equity Incentive Plan [Member] A 2019 and 2017 equity incentive plan. Convertible Preferred Stock, Policy Convertible Preferred Stock, Policy [Policy Text Block] Convertible Preferred Stock Accrued Liabilities and Other Liabilities Assumed payables and accruals Common Stock, Voting Rights Voting rights of stock Entity Filer Category Entity Filer Category Capitalized R&D Deferred Tax Assets Capital Research And Development Deferred Tax Assets Capital Research And Development Entity Current Reporting Status Entity Current Reporting Status Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Stock-based compensation ICFR Auditor Attestation Flag Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Attributable to Parent, Total Stockholders' Equity Attributable to Parent Ending balance Beginning balance Property and equipment in accounts payable Noncash or Part Noncash Acquisition, Fixed Assets Acquired Temporary Equity, Shares Authorized Shares Authorized Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference Entity Tax Identification Number Entity Tax Identification Number Income Statement Location [Axis] Income Statement Location [Axis] Common stock, $0.001 par value; 100,000,000 shares authorized; 10,518,539 and 6,910,324 shares issued and outstanding at December 31, 2022 and 2021, respectively Common Stock, Value, Issued Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit) Accumulated deficit Equipment [Member] Lab equipment Repayment of Notes Receivable from Related Parties Repayment of related party note receivable Equity Components [Axis] Equity Components [Axis] APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Share-based compensation Acquisition related costs Business Combination, Acquisition Related Costs Transaction costs Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Prepaid Expense, Current, Total Prepaid Expense, Current Prepaid expenses Series B-1 Series B One Convertible Preferred Stock [Member] Series B-1 convertible preferred stock. Debt Conversion Description [Axis] Debt Conversion Description [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Operating Expenses [Abstract] Operating expenses: Interest Expense, Debt, Total Interest Expense, Debt Interest expense Other income (expenses), net: Other Nonoperating Income (Expense) [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Annual floating interest rate Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate 2019 Equity Incentive Plan 2019 Equity Incentive Plan [Member] 2019 Equity Incentive Plan Debt Instrument, Periodic Payment, Principal Monthly principal payments Adjustments to Additional Paid in Capital, Warrant Issued Issuance of common stock warrants Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Letter of Credit Letter of Credit [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Expected term (in years) Area of property (in sqft) Area of Real Estate Property Area of real estate property Entity Voluntary Filers Entity Voluntary Filers Research Tax Credit Carryforward [Member] Research Tax Credit Carryforward Retirement Benefits [Abstract] Document Transition Report Document Transition Report Shares issued in transaction Sale of Stock, Number of Shares Issued in Transaction Total Assets, Fair Value Disclosure Estimated Litigation Liability, Current Accrued legal settlement Total other income (expenses), net Nonoperating Income (Expense) VestingOfEarlyExercisedStockOptionsAndRestrictedStockShares VestingOfEarlyExercisedStockOptionsAndRestrictedStockShares Vesting of early exercised stock options (in shares) Stock price (in dollars per share) Sale of Stock, Price Per Share Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Tax Period [Domain] Tax Period [Domain] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fixed Assets Deferred Tax Assets, Property, Plant and Equipment Net Income (Loss) Attributable to Parent, Total Net Income (Loss) Attributable to Parent Net loss Less: current portion Current operating lease liabilities Operating Lease, Liability, Current Less: current portion Adjustments to Additional Paid in Capital, Other Reverse recapitalization transaction costs Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Additional Paid-In Capital Additional Paid-in Capital [Member] Stock Issued Issuance of common stock for license agreement Deferred Tax Assets, Operating Loss Carryforwards, Total Deferred Tax Assets, Operating Loss Carryforwards Net operating losses Share-based compensation arrangement by share-based payment award, maximum number of shares available for grant per year Share Based Compensation Arrangement By Share Based Payment Award Maximum Number Of Shares Available For Grant Per Year Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Available for Grant Per Year Entity Registrant Name Entity Registrant Name Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Lapses in statutes of limitations Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Earnings Per Share [Text Block] Net Loss Per Share Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of Grant Date Fair Value Class of Stock [Axis] Class of Stock [Axis] Loan mature date Debt Instrument, Maturity Date Property, Plant and Equipment, Net Property and equipment—net Property and equipment—net Payment Of Reverse Recapitalization Transaction Costs Payment Of Reverse Recapitalization Transaction Costs Payment of reverse recapitalization transaction costs Statement [Line Items] Statement [Line Items] Operating Lease, Expense Rent expense Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Title of 12(b) Security Title of 12(b) Security Common Stock [Member] Common Stock Consideration received Sale of Stock, Consideration Received on Transaction Share-based compensation arrangement by share-based payment award, expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Equity Component [Domain] Equity Component [Domain] Fair Value Measurement, Policy [Policy Text Block] Fair Value Measurements ThersholdIndexRate ThersholdIndexRate Thershold index rate Entity Address, State or Province Entity Address, State or Province 2026 Lessee, Operating Lease, Liability, to be Paid, Year Four Geographical [Axis] Statement Geographical Axis [Axis] Significant Risks And Uncertainties, Policy Significant Risks And Uncertainties, Policy [Policy Text Block] Risks and Uncertainties Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Document Type Document Type Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for interest Deferred Tax Assets, Operating Loss Carryforwards, Domestic Operating loss carryforwards, federal Lease modification Lease Obligation Incurred 2019 Employee Stock Purchase Plan 2019 Employee Stock Purchase Plan [Member] 2019 Employee Stock Purchase Plan Non-cash operating activities: Additional Cash Flow Elements, Operating Activities [Abstract] Series A Series A Convertible Preferred Stock [Member] Series A convertible preferred stock. Entity Shell Company Entity Shell Company AccruedClinicalTrialLiability AccruedClinicalTrialLiability Accrued clinical trial liability Share-Based Payment Arrangement, Expense Stock-based compensation expense Loss Contingencies [Line Items] Loss Contingencies [Line Items] Stockholders' equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Security Exchange Name Security Exchange Name Class of Stock [Line Items] Class of Stock [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Brisbane, California Brisbane California [Member] Brisbane California. Net Cash Provided by (Used in) Operating Activities Cash used in operating activities Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Commitments and Contingencies Disclosure [Abstract] Interest and Dividends Payable, Current, Total Interest and Dividends Payable, Current Interest payable Future Minimum Rental Payments under Operating Leases with Noncancelable Terms Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of Unrecognized Tax Benefits Roll Forward Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total Effective Income Tax Rate Reconciliation, Tax Credit, Amount Tax credits Private Tempest Preferred Stock Private Tempest Preferred Stock [Member] Private tempest preferred stock. Share-Based Payment Arrangement, Option, Activity [Table Text Block] Summary of Stock Options Deferred Tax Liabilities, Operating Lease, Right-of Use Assets Deferred Tax Liabilities, Operating Lease, Right-of Use Assets Right-of-use assets New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Pronouncements Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding Common stock, shares outstanding Business Acquisition [Line Items] Business Acquisition [Line Items] Loan Payable Debt Disclosure [Text Block] Fair Value, Inputs, Level 2 [Member] Level 2 Proceeds from Issuance of Long-Term Debt, Total Proceeds from Issuance of Long-Term Debt Borrowings on loan payable Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Stock issuance costs Stock Issuance Costs Stock Issuance Costs. Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Gross increase - tax position in current period Commitments and contingencies (Note 6) Commitments and Contingencies Common Stock, Shares, Issued Common stock, shares issued Liabilities [Abstract] Liabilities [Abstract] Minimum [Member] Minimum PIPE Financing Private Investment In Public Entity Financing [Member] Private investment in public entity financing. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Grantee Status [Domain] Grantee Status [Domain] Lessee, Leases [Policy Text Block] Lessee, Leases Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Accrued expenses Total Accrued Liabilities, Current Accrued expenses and other liabilities Counterparty Name [Axis] Counterparty Name [Axis] Entity Address, Address Line Two Entity Address, Address Line Two Deferred Tax Assets and Valuation Allowance, Deferred Tax Asset, Period Increase (Decrease), Amount Deferred Tax Assets and Valuation Allowance, Deferred Tax Asset, Period Increase (Decrease), Amount Deferred tax assets and valuation allowance increase during period Subsequent Event [Member] Subsequent Event Deferred Tax Assets, Gross Total gross deferred tax assets Loss Contingencies [Table] Loss Contingencies [Table] Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment of Long-Lived Assets Interest income and other income (expenses), net Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense) Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount, Total Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Permanent differences Stock Issued During Period, Value, Other Issuance of common stock to Millendo shareholders Lessee, Operating Lease, Liability, to be Paid Total minimum lease payments Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Gross decrease - tax positions in prior periods Term of contract Lessee, Operating Lease, Term of Contract Operating lease term Entity Central Index Key Entity Central Index Key Net Income (Loss) Attributable to Parent [Abstract] Numerator: Accounting Policies [Abstract] Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued expenses and other liabilities South San Francisco, California. South San Francisco, California South San Francisco, California [Member] South San Francisco California Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected volatility Measurement Frequency [Axis] Measurement Frequency [Axis] General and Administrative Expense, Total General and Administrative Expense General and administrative Organization, Consolidation and Presentation of Financial Statements [Abstract] Outstanding (in dollars per share) Outstanding at beginning (in dollars per share) Outstanding at end (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Research and Development Expense [Member] Research and Development Expense Net of discount and issuance costs Debt Issuance Costs, Net, Total Debt Issuance Costs, Net Debt issuance costs, net Operating lease right-of-use assets recognized in exchange for lease liabilities Operating lease right-of-use assets recognized in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Retained Earnings [Member] Deficit Accumulated Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] EcoR1 Capital, LLC and Versant Venture Capital EcoR1 Capital LLC And Versant Venture Capital [Member] EcoR1 Capital LLC and Versant Venture Capital. Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 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 Property and equipment Additional Paid in Capital, Total Additional Paid in Capital Additional paid-in capital Entity Interactive Data Current Entity Interactive Data Current Tax Credit Carryforward, Amount Tax credit carryforwards Entity Public Float Entity Public Float Temporary Equity [Line Items] Temporary Equity [Line Items] 2023 Lessee, Operating Lease, Liability, to be Paid, Year One Leasehold improvements Leasehold Improvements [Member] Temporary Equity, Shares Outstanding Shares Outstanding Proceeds from issuance of pre-funded warrants, net of issuance costs Proceeds from Issuance of Warrants Local Phone Number Local Phone Number Statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Unrecognized Tax Benefits Ending balance Beginning balance Sale of stock, amount authorized Sale of Stock, Amount Authorized Sale of Stock, Amount Authorized Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Summary of Basis in Diluted Net Loss Per Share Share-based compensation arrangement by share-based payment award, award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Debt Disclosure [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Assumed in reverse recapitalization (in shares) ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedInReverseRecapitalizationInPeriod ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedInReverseRecapitalizationInPeriod ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedInReverseRecapitalizationInPeriod Temporary Equity, Liquidation Preference Aggregate Liquidation Amount Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Stock Issued During Period, Value, Conversion of Units Conversion of preferred stock to common stock Income Statement Location [Domain] Income Statement Location [Domain] Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Settlements Long-term debt Long-Term Debt Long-Term Debt, Total Shares, Outstanding Ending balance (in shares) Beginning balance (in shares) Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Outstanding at beginning (in shares) Outstanding at end (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Legacy Millendo Legacy Millendo [Member] Legacy Millendo Document Fiscal Year Focus Document Fiscal Year Focus Repayment of loan Repayment of debt Repayments of Debt Payments of Debt Issuance Costs Payments of debt issuance costs 2024 Lessee, Operating Lease, Liability, to be Paid, Year Two Net loss per share of common stock and pre-funded warrants, basic Net loss per share attributable to common stockholders - basic Earnings Per Share, Basic, Total Earnings Per Share, Basic Cash paid for income taxes Income Taxes Paid Ann Arbor, Michigan Ann Arbor Michigan [Member] Ann Arbor Michigan. Assets [Abstract] Assets [Abstract] Deferred Tax Assets, Net Net deferred tax assets Total Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Debt Instrument, Face Amount Loan amount Term Loan Term Loan [Member] Term loan. Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Stock-Based Compensation Shareholders' Equity and Share-Based Payments [Text Block] Liabilities and stockholders' equity Liabilities and Equity [Abstract] Stock Issued During Period, Shares, Other Issuance of common stock to Millendo shareholders (in shares) Income Tax [Line Items] Income Tax [Line Items] Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Income Tax Authority [Axis] Income Tax Authority [Axis] Increase (Decrease) in Accounts Payable, Trade Accounts payable Deferred Tax Assets, Net of Valuation Allowance Total deferred tax assets Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net loss Temporary Equity Disclosure [Abstract] Assets, Current [Abstract] Current assets: Dividends, Common Stock, Total Dividends, Common Stock Dividends Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Gross increase - tax positions in prior periods Defined Contribution Plan, Employer Discretionary Contribution Amount Defined Contribution Plan, Employer Discretionary Contribution Amount Measurement Frequency [Domain] Measurement Frequency [Domain] Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Temporary Equity, Liquidation Preference Per Share Per Share Liquidation Preference Entity [Domain] Entity [Domain] Series B Series B Convertible Preferred Stock [Member] Series B convertible preferred stock. Cover [Abstract] Number of non-cancelable lease agreements NumberOfNonCancelableOperatingLeaseAgreements NumberOfNonCancelableOperatingLeaseAgreements Number of noncancelable operating lease agreements Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Income Tax Reserve [Roll Forward] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Five Liabilities, Current [Abstract] Current liabilities: Maximum [Member] Maximum Net Cash Provided by (Used in) Investing Activities Cash used in investing activities Furniture and Fixtures [Member] Furniture and fixtures Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Exercised (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Exercised of stock options (in shares) Deferred Tax Assets, Operating Lease Liability Deferred Tax Assets, Operating Lease Liability Lease liability Fair Value, Inputs, Level 3 [Member] Level 3 Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Schedule of Stock Based Compensation Expense Use of Estimates, Policy [Policy Text Block] Use of Estimates Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Deferred Tax Liabilities, Gross, Total Deferred Tax Liabilities, Gross Total gross deferred tax liabilities Stock Issued During Period, Value, Stock Options Exercised Exercised of stock options Segment Reporting, Policy [Policy Text Block] Segment Information Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Employee Stock Ownership Plan Employee Stock Ownership Plan [Member] Employee stock ownership plan. Property, plant and equipment, useful life Property, Plant and Equipment, Useful Life Prepaids and other assets Prepaid Expense and Other Assets Prepaid expenses and other assets Deferred Tax Assets, Net [Abstract] Deferred tax assets: Common Stock, Shares Authorized Common stock, shares authorized Trading Symbol Trading Symbol Orphan Drug Credit Orphan Drug Credit [Member] Orphan Drug Credit Subsequent Event Type [Axis] Subsequent Event Type [Axis] Deferred Tax Assets, Other Other Debt instrument interest term Debt Instrument, Interest Rate Terms Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Risk-free interest rate Accounts Payable, Current, Total Accounts Payable, Current Accounts payable Plan Name [Axis] Plan Name [Axis] Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount At statutory rate South San Francisco, California and Ann Arbor, Michigan South San Francisco California and Ann Arbor Michigan [Member] South San Francisco California and Ann Arbor Michigan. Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Number of warrants issued Sale Of Stock Warrants Issued Sale of stock warrants issued. Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Debt Conversion, Name [Domain] Debt Conversion, Name [Domain] Conversion of convertible securities Stock Issued During Period, Value, Conversion of Convertible Securities Property, plant and equipment, useful lives Property, Plant and Equipment, Estimated Useful Lives Research and Development Expense (Excluding Acquired in Process Cost) Research and development Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based compensation arrangement by share-based payment award, number of additional shares authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Debt Instrument [Line Items] Debt Instrument [Line Items] Long-Term Debt, Type [Domain] Long-term Debt, Type [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive securities excluded from computation of earnings Cash and Cash Equivalents, Fair Value Disclosure Cash and cash equivalents Non-cash financing activities: Noncash Investing and Financing Items [Abstract]