Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Operating lease liabilities, less current portion Operating Lease, Liability, Noncurrent Measurement Frequency [Domain] Measurement Frequency [Domain] Letter of Credit Letter of Credit [Member] Debt Instrument, Face Amount Debt Instrument, Face Amount Interest expense Interest Expense Leasehold improvements Leasehold Improvements [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net loss Net Income (Loss) Attributable to Parent Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Stockholders' Equity, Reverse Stock Split Stockholders' Equity, Reverse Stock Split Accrued compensation Employee-related Liabilities, Current Income Statement Location [Axis] Income Statement Location [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Acquisition related costs Business Combination, Acquisition Related Costs Accumulated deficit Retained Earnings (Accumulated Deficit) Term of contract Lessee, Operating Lease, Term of Contract Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Remaining lease term Lessee, Operating Lease, Remaining Lease Term Business Acquisition [Line Items] Business Acquisition [Line Items] Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Number of tranches Debt Instrument, Number of Tranches Debt Instrument, Number of Tranches Debt Conversion Description [Axis] Debt Conversion Description [Axis] Income Statement [Abstract] Interest and other (expense) income, net Interest and Other Income Term Loan Member Term Loan Member [Member] Term Loan Member Cancelled and forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Entity Registrant Name Entity Registrant Name Prepaid expense and other assets Prepaid Expense and Other Assets Shares Issued and Outstanding Temporary Equity, Shares Outstanding Other noncurrent assets Other Assets, Noncurrent Property and equipment in accounts payable Noncash or Part Noncash Acquisition, Fixed Assets Acquired Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Proceeds from option exercises Proceeds from Stock Options Exercised Dividends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Debt Instrument, Unamortized Discount, Noncurrent Debt Instrument, Unamortized Discount, Noncurrent Retirement Benefits [Abstract] Tranch B Term Loan Member Tranch B Term Loan Member [Member] Tranch B Term Loan Member Amount covered by insurance Litigation Expense Amount Covered By Insurance Litigation Expense Amount Covered By Insurance Entity File Number Entity File Number Cancelled and forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Provision for income taxes Income Tax Expense (Benefit) Total stockholders’ equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Amendment Flag Amendment Flag Borrowings on loan payable Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Entity Tax Identification Number Entity Tax Identification Number Fair Value Disclosures [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Assets, Current Total minimum lease payments Lessee, Operating Lease, Liability, to be Paid Sale of Stock [Domain] Sale of Stock [Domain] Debt Conversion, Name [Domain] Debt Conversion, Name [Domain] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Organization, Consolidation and Presentation of Financial Statements [Abstract] Issuance of pre-funded warrants, net Adjustments to Additional Paid in Capital, Warrant Issued Statement of Financial Position [Abstract] Antidilutive securities excluded from computation of earnings Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Research and Development Expense Research and Development Expense [Member] Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Sale of Stock [Axis] Sale of Stock [Axis] Grantee Status [Axis] Grantee Status [Axis] Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Less: Weighted-average unvested restricted shares and shares subject to repurchase Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation Business Combination and Asset Acquisition [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Equity Component [Domain] Equity Component [Domain] Interest payable Increase (Decrease) in Interest Payable, Net 2023 Lessee, Operating Lease, Liability, to be Paid, Year One Vesting of early exercise stock options Vesting of early exercise stock options Vesting of early exercise stock options 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 Local Phone Number Local Phone Number Credit Facility [Domain] Credit Facility [Domain] Non-cash operating activities: Additional Cash Flow Elements, Operating Activities [Abstract] Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Statement [Line Items] Statement [Line Items] Series B-1 Series B One Convertible Preferred Stock Member [Member] Series B One Convertible Preferred Stock Member Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Grantee Status [Domain] Grantee Status [Domain] Research and development Research and Development Expense (Excluding Acquired in Process Cost) At-The-Market Program At-The-Market Program [Member] At-The-Market Program Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding at beginning (in shares) Outstanding at end (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Schedule of Stock Based Compensation Expense Share-based Payment Arrangement, Cost by Plan [Table Text Block] Accumulated Deficit Retained Earnings [Member] Counterparty Name [Domain] Counterparty Name [Domain] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Interest payable Interest and Dividends Payable, Current Area of property (in sqft) Area of Real Estate Property Debt Disclosure [Abstract] Employee Stock Ownership Plan Employee Stock Ownership Plan [Member] Employee Stock Ownership Plan 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 ThersholdIndexRate ThersholdIndexRate ThersholdIndexRate Commitments and Contingencies Disclosure Commitments and Contingencies Disclosure [Text Block] Level 2 Fair Value, Inputs, Level 2 [Member] Stock Issued During Period, Value, Conversion of Convertible Securities Stock Issued During Period, Value, Conversion of Convertible Securities Vesting of early exercised stock options Vesting Of Early Exercised Stock Options And Restricted Stock Vesting Of Early Exercised Stock Options And Restricted Stock Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Common stock warrants Common Stock Warrants Member [Member] Common Stock Warrants Member Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Proceeds from issuance of pre-funded warrants, net of issuance costs Proceeds from Issuance of Warrants South San Francisco, California South San Francisco, California [Member] South San Francisco, California Summary of Convertible Preferred Stock Temporary Equity [Table Text Block] Jefferies LLC Jefferies LLC [Member] Jefferies LLC Retirement Plan Retirement Benefits [Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable, Trade Summary of Basis in Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Commitments and Contingencies Disclosure [Abstract] Net Carrying Value Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Title of 12(b) Security Title of 12(b) Security Proceeds from the issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Total assets Assets Plan Name [Domain] Plan Name [Domain] Common stock, shares authorized Common Stock, Shares Authorized Weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Issued, Basic 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 Unaudited Interim Financial Statement Unaudited Interim Financial Statement, Policy [Policy Text Block] Unaudited Interim Financial Statement, Policy Net loss per share of common stock, basic (in dollars per share) Earnings Per Share, Basic Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Numerator: Net Income (Loss) Attributable to Parent [Abstract] Rent expense Operating Lease, Expense Statement Geographical Axis [Domain] Geographical [Domain] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Three Document Type Document Type Balance Sheet Items Supplemental Balance Sheet Disclosures [Text Block] Interest Expense, Debt Interest Expense, Debt Prepaid expenses Prepaid Expense, Current Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Cash used in operating activities Net Cash Provided by (Used in) Operating Activities 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 Furniture and fixtures Furniture and Fixtures [Member] Schedule of prepaid expenses and other current asset Schedule Of Prepaid Expenses And Other Current Asset [Table Text Block] Schedule Of Prepaid Expenses And Other Current Asset Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] PIPE Financing Private Investment In Public Entity Financing [Member] Private Investment In Public Entity Financing Statement Geographical Axis [Axis] Geographical [Axis] Accrued liabilities and other liabilities Accrued Liabilities and Other Liabilities Weighted-average shares of common stock outstanding, basic (in shares) Weighted-average shares of common stock outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Net loss per share of common stock, diluted (in dollars per share) Earnings Per Share, Diluted 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 Number of non-cancelable lease agreements NumberOfNonCancelableOperatingLeaseAgreements NumberOfNonCancelableOperatingLeaseAgreements Stock price (in dollars per share) Sale of Stock, Price Per Share 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 Plan Name [Axis] Plan Name [Axis] Shares Authorized Temporary Equity, Shares Authorized Long-term debt Long-term Debt Assets, Fair Value Disclosure Assets, Fair Value Disclosure Level 1 Fair Value, Inputs, Level 1 [Member] Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Entity Small Business Entity Small Business Warrant notice period Sale of Stock, Warrant Covenants, Notice Period Sale of Stock, Warrant Covenants, Notice Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period BusinessCombinationExchangeRatio BusinessCombinationExchangeRatio BusinessCombinationExchangeRatio Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Total liabilities and stockholders’ equity Liabilities and Equity Accrued other liabilities Other Accrued Liabilities, Current 2019 Equity Incentive Plan 2019 Equity Incentive Plan [Member] 2019 Equity Incentive Plan StockholdersEquityNoteStockSplitExchangeRatio StockholdersEquityNoteStockSplitExchangeRatio StockholdersEquityNoteStockSplitExchangeRatio Payment of reverse recapitalization transaction costs Payment Of Reverse Recapitalization Transaction Costs Payment Of Reverse Recapitalization Transaction Costs Fair Value Measurements Fair Value Disclosures [Text Block] Accounts payable Accounts Payable, Current Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Prepaid research and development costs Prepaid Research and Development Costs, Current Prepaid Research and Development Costs, Current Additional paid-in capital Additional Paid in Capital Summary of Information About Stock Options Outstanding Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Accrued legal settlement Estimated Litigation Liability, Current Common stock, shares outstanding Common Stock, Shares, Outstanding Net Loss Per Share Earnings Per Share [Text Block] Private Tempest Private Tempest Member [Member] Private Tempest Member Temporary Equity Disclosure [Abstract] Entity Interactive Data Current Entity Interactive Data Current Tranch C Term Loan Member Tranch C Term Loan Member [Member] Tranch C Term Loan Member Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Minimum Minimum [Member] Document Period End Date Document Period End Date Organization and Description of the Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Stock issuance costs StockIssuanceCosts StockIssuanceCosts Entity Central Index Key Entity Central Index Key Non-cash lease expense Noncash lease expense Noncash lease expense Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Two Conversion Of Preferred Stock Into A Share Of Common Stock Conversion Of Preferred Stock Into A Share Of Common Stock Member [Member] Conversion Of Preferred Stock Into A Share Of Common Stock Member Net of discount and issuance costs Debt Issuance Costs, Net Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Summary of property and equipment Property, Plant and Equipment [Table Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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 Entity Address, State or Province Entity Address, State or Province Loss Contingencies [Line Items] Loss Contingencies [Line Items] Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net 2019 and 2017 Equity Incentive Plan 2019 and 2017 Equity Incentive Plan [Member] 2019 and 2017 Equity Incentive Plan EcoR1 Capital, LLC and Versant Venture Capital EcoR1 Capital, LLC and Versant Venture Capital [Member] EcoR1 Capital, LLC and Versant Venture Capital Stock Compensation Shareholders' Equity and Share-based Payments [Text Block] Number of warrants issued Sale of Stock, Warrants Issued Sale of Stock, Warrants Issued Issuance of common stock for cash Stock Issued During Period, Value, New Issues Share-based Payment Arrangement, Employee Share-based Payment Arrangement, Employee [Member] Operating lease liabilities Increase (Decrease) in Operating Lease Liability Aggregate Liquidation Amount Temporary Equity, Liquidation Preference General and administrative General and Administrative Expense Debt Instrument [Line Items] Debt Instrument [Line Items] Loan Payable Debt Disclosure [Text Block] Trading Symbol Trading Symbol Earnings Per Share [Abstract] Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding 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 Private Tempest Preferred Stock Member Private Tempest Preferred Stock Member [Member] Private Tempest Preferred Stock Member Property and equipment Property, Plant and Equipment, Gross Level 3 Fair Value, Inputs, Level 3 [Member] Accounting Policies [Abstract] 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 Accrued clinical trial liabilities AccruedClinicalTrialLiability AccruedClinicalTrialLiability Lab equipment Equipment [Member] Issuance of common stock for cash (in shares) Stock Issued During Period, Shares, New Issues Present value of operating lease obligations Present value of operating lease obligations Operating Lease, Liability Document Transition Report Document Transition Report 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 Common stock, $0.001 par value; 100,000,000 shares authorized at March 31, 2022 and December 31, 2021; 7,173,094 and 6,910,324 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively Common Stock, Value, Issued Total other (expense) income, net Nonoperating Income (Expense) 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 Convertible Preferred Stock Convertible Preferred Stock [Text Block] Convertible Preferred Stock Cash acquired in connection with reverse recapitalization Proceeds From Merger Related Cost, Financing Activities Proceeds From Merger Related Cost, Financing Activities Loan payable (net of discount and issuance costs of $524 and $756, respectively) Long-term Debt, Excluding Current Maturities Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Net increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Commitments and contingencies (Note 6) Commitments and Contingencies Record pre-merger Millendo stockholders’ equity and elimination of Millendo historical accumulated deficit Stock Issued During Period, Value, Other Stock-based compensation expense Share-based Payment Arrangement, Expense Entity Emerging Growth Company Entity Emerging Growth Company 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 Entity Current Reporting Status Entity Current Reporting Status 2022 (excluding the six months ended June 30, 2022) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Millendo Merger Business Combination Disclosure [Text Block] Payments of Debt Issuance Costs Payments of Debt Issuance Costs Net loss Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Summary of Grant Date Fair Value Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Insurance recovery of legal settlement Restricted Cash, Current Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Counterparty Name [Axis] Counterparty Name [Axis] 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 Ann Arbor, Michigan Ann Arbor Michigan Member [Member] Ann Arbor Michigan Member Record pre-merger Millendo stockholders’ equity and elimination of Millendo historical accumulated deficit (in shares) Stock Issued During Period, Shares, Other Cover [Abstract] Debt Instrument, Periodic Payment, Principal Debt Instrument, Periodic Payment, Principal Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Class of Stock [Axis] Class of Stock [Axis] Shares issued in transaction Sale of Stock, Number of Shares Issued in Transaction Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Assumed in reverse recapitalization (in dollars per share) ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsassumedInReverseRecapitalizationInPeriodWeightedAverageExercisePrice ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsassumedInReverseRecapitalizationInPeriodWeightedAverageExercisePrice Brisbane, California Brisbane, California [Member] Brisbane, California Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Common Stock, Capital Shares Reserved for Future Issuance Common Stock, Capital Shares Reserved for Future Issuance Consideration received Sale of Stock, Consideration Received on Transaction Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Entity Address, Postal Zip Code Entity Address, Postal Zip Code Conversion of preferred stock to common stock Stock Issued During Period, Value, Conversion of Units Exercise of stock options (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Prepaid expenses and other current assets Total Prepaid Expense and Other Assets, Current Insurance settlements receivable Insurance Settlements Receivable Weighted-average shares of common stock outstanding, diluted (in shares) Weighted-average shares of common stock outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Accrued expenses Accrued expenses Accrued Liabilities, Current Sale of Stock, Amount Authorized Sale of Stock, Amount Authorized Sale of Stock, Amount Authorized Fair Value, Recurring Fair Value, Recurring [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Summary of Stock Options Share-based Payment Arrangement, Option, Activity [Table Text Block] Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Common Stock and Convertible Preferred Stock Stockholders' Equity Note Disclosure [Text Block] Non-cash investing activities: Additional Cash Flow Elements, Investing Activities [Abstract] Options to purchase common stock Share-based Payment Arrangement, Option [Member] Per Share Liquidation Preference Temporary Equity, Liquidation Preference Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Document Quarterly Report Document Quarterly Report Statement of Cash Flows [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 Class of Stock [Line Items] Class of Stock [Line Items] Credit Facility [Axis] Credit Facility [Axis] Common Stock Common Stock [Member] Entity Address, Address Line One Entity Address, Address Line One Cash used in investing activities Net Cash Provided by (Used in) Investing Activities 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 Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Loss from operations Operating Income (Loss) Defined Contribution Plan, Employer Discretionary Contribution Amount Defined Contribution Plan, Employer Discretionary Contribution Amount Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] General and Administrative Expense General and Administrative Expense [Member] Entity Shell Company Entity Shell Company Current operating lease liabilities Less: current portion Operating Lease, Liability, Current Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Class of Stock [Domain] Class of Stock [Domain] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Temporary Equity [Line Items] Temporary Equity [Line Items] Share-based compensation APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition Additional Paid-in Capital Additional Paid-in Capital [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Depreciation expense Depreciation Lease modification Lease Obligation Incurred Assumed in reverse recapitalization (in shares) ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedInReverseRecapitalizationInPeriod ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedInReverseRecapitalizationInPeriod Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Series B Series B Convertible Preferred Stock Member [Member] Series B Convertible Preferred Stock Member Loss Contingencies [Table] Loss Contingencies [Table] 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 Current Fiscal Year End Date Current Fiscal Year End Date Conversion of preferred stock to common stock (in shares) Stock Issued During Period, Shares, Conversion of Units 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 Beneficial ownership percentage Sale of Stock, Warrant Covenants, Maximum Ownership Percentage Sale of Stock, Warrant Covenants, Maximum Ownership Percentage Other current assets Other Assets, Current Statement [Table] Statement [Table] Series A Series A Convertible Preferred Stock Member [Member] Series A Convertible Preferred Stock Member Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment South San Francisco, California South San Francisco California Member [Member] South San Francisco California Member Maximum Maximum [Member] Non-cash interest and other expense, net Noncash interest and other expense, net Noncash interest and other expense, net Share-based Payment Arrangement [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from Issuance of Redeemable Convertible Preferred Stock Total liabilities Liabilities Schedule of accrued liabilities Schedule of Accrued Liabilities [Table Text Block] Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] 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 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 Future minimum rental payments under operating leases with noncancelable terms Lessee, Operating Lease, Liability, Maturity [Table Text Block] Beginning balance Ending balance Stockholders' Equity Attributable to Parent Tranch A Term Loan Member Tranch A Term Loan Member [Member] Tranch A Term Loan Member Common stock, shares issued Common Stock, Shares, Issued City Area Code City Area Code Reverse recapitalization transaction costs Adjustments to Additional Paid in Capital, Reverse Recapitalization Transaction Costs Adjustments to Additional Paid in Capital, Reverse Recapitalization Transaction Costs 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 Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] 2026 and beyond Lessee, Operating Lease, Liability, to be Paid, Due After Year Four Lessee, Operating Lease, Liability, to be Paid, Due After Year Four Vesting of early exercised stock options (in shares) VestingOfEarlyExercisedStockOptionsAndRestrictedStockShares VestingOfEarlyExercisedStockOptionsAndRestrictedStockShares Entity Address, City or Town Entity Address, City or Town Computer equipment and software Computer Equipment [Member] Warrant issuance costs Warrant Issuance Costs Warrant Issuance Costs Current loan payable Notes Payable, Current Non-cash financing activities: Noncash Investing and Financing Items [Abstract] Payment of loan issuance costs Payments of Loan Costs