Entity Central Index Key Lessee operating lease liability payments due after year four. Cover [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Trading Symbol Trading Symbol Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Small Business Entity Small Business Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Interactive Data Current Entity Interactive Data Current Title of 12(b) Security Security12b Title Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Shell Company Entity Shell Company Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Accrued expenses and other current liabilities. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Series A convertible preferred stock. Series A Convertible Preferred Stock Series A Convertible Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term investments Short Term Investments Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Restricted cash Restricted Cash Prepaid and other long-term assets Prepaid Expense And Other Assets Noncurrent Long-term investments Long Term Investments Right-of-use assets Operating Lease Right Of Use Asset Total assets Assets Liabilities and Stockholders' Equity Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses and other current liabilities Accrued Expenses And Other Current Liabilities Loan payable Loans Payable Current Short-term operating lease liabilities Operating Lease Liability Current Total current liabilities Liabilities Current Long-term operating lease liabilities Operating Lease Liability Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 9) Commitments And Contingencies Series A convertible preferred stock, $0.0001 par value; 0 and 7,064,925 shares authorized as of September 30, 2021 and December 31, 2020; 0 and 7,064,925 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively Temporary Equity Carrying Amount Attributable To Parent Stockholders' equity Stockholders Equity [Abstract] Preferred stock, $0.0001 par value; 10,000,000 and 0 shares authorized as of September 30, 2021 and December 31, 2020; 0 and 0 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively Preferred Stock Value Common stock, $0.0001 par value; 300,000,000 and 25,300,080 shares authorized as of September 30, 2021 and December 31, 2020, respectively; 29,041,708 and 11,953,107 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders' equity Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity Preferred stock, par value Temporary Equity Par Or Stated Value Per Share Preferred stock, shares authorized Temporary Equity Shares Authorized Preferred stock, shares issued Temporary Equity Shares Issued Preferred stock, shares outstanding Temporary Equity Shares Outstanding Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Operating expenses: Operating Expenses [Abstract] Research and development Research And Development Expense General and administrative General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Interest and other income, net Interest And Other Income Net loss Net Income Loss Other comprehensive loss: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Unrealized gain on investments, net Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Net loss per common share, basic and diluted Earnings Per Share Basic And Diluted Weighted-average number of common shares used to compute basic and diluted net loss per common share Weighted Average Number Of Share Outstanding Basic And Diluted Temporary equity, stock issued during period, financing costs. Temporary equity conversion of convertible preferred stock into common stock. Statement Of Stockholders Equity [Abstract] Accumulated Other Comprehensive Gain (Loss) Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Gain (Loss) Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] IPO I P O [Member] Balance Balance (in shares) Balance Balance (in shares) Shares Outstanding Series A financing costs Temporary Equity Stock Issued During Period Financing Costs Issuance of common stock, net of offering costs Stock Issued During Period Value New Issues Issuance of common stock, net of offering costs (in shares) Stock Issued During Period Shares New Issues Issuance of restricted stock Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures Issuance of restricted stock (in shares) Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures Stock-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Exercise of stock options Stock Issued During Period Value Stock Options Exercised Exercise of stock options, (in shares) Stock Issued During Period Shares Stock Options Exercised Conversion of preferred stock to common stock Stock Issued During Period Value Conversion Of Convertible Securities Conversion of preferred stock to common stock (in shares) Temporary Equity Conversion Of Convertible Preferred Stock Into Common Stock Conversion of convertible preferred stock into common stock Reclassifications Of Temporary To Permanent Equity Conversion of preferred stock to common stock (in shares) Stock Issued During Period Shares Conversion Of Convertible Securities Unrealized gain (loss) on investments Net loss and comprehensive loss Balance Balance (in shares) Balance Balance (in shares) Non-cash operating lease expense. Increase decrease in lease liabilities. Noncash or part noncash acquisition of right of use asset. Change in unrealized gain on investments. Statement Of Cash Flows [Abstract] Operating Activities Net Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss 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] Depreciation Depreciation Non-cash operating lease expense Non Cash Operating Lease Expense Stock-based compensation expense Share Based Compensation Net amortization of premiums and accretion of discounts on investments Accretion Amortization Of Discounts And Premiums Investments Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Other assets Increase Decrease In Other Operating Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses and other current liabilities Increase Decrease In Accrued Liabilities And Other Operating Liabilities Lease liabilities Increase Decrease In Lease Liabilities Net cash used in operating activities Net Cash Provided By Used In Operating Activities Investing Activities Net Cash Provided By Used In Investing Activities [Abstract] Purchase of property and equipment Payments To Acquire Property Plant And Equipment Purchase of investments Payments To Acquire Investments Maturities of investments Proceeds From Sale Maturity And Collections Of Investments Net cash used in investing activities Net Cash Provided By Used In Investing Activities Financing Activities Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from issuance of common stock from seed series Proceeds From Issuance Of Common Stock Series A financing costs incurred Payments Of Stock Issuance Costs Net proceeds from issuance of common stock from initial public offering Proceeds From Issuance Initial Public Offering Proceeds from stock option exercise Proceeds From Stock Options Exercised Proceeds (payment) from Paycheck Protection Program loan Proceeds From Repayments Of Notes Payable Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net increase in cash, cash equivalents, and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash, cash equivalents, and restricted cash at the beginning of the period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash, cash equivalents, and restricted cash at the end of the period Non-cash financing and investing activities: Noncash Investing And Financing Items [Abstract] Conversion of convertible preferred stock into common stock Conversion Of Stock Amount Issued1 Acquisition of right of use asset Noncash Or Part Noncash Acquisition Of Right Of Use Asset Acquisition of fixed assets in accounts payable and accrued liabilities Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 Change in unrealized gain on investments Change In Unrealized Gain On Investments Reconciliation of cash and cash equivalents and restricted cash: Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract] Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurement Fair Value Disclosures [Text Block] Property Plant And Equipment [Abstract] Property and Equipment, Net Property Plant And Equipment Disclosure [Text Block] Leases [Abstract] Leases Lessee Operating Leases [Text Block] Balance Sheet Related Disclosures [Abstract] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Equity [Abstract] Capital Structure Stockholders Equity Note Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Earnings Per Share [Abstract] Net Loss and Net Loss Per Share Earnings Per Share [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Use of Estimates Use Of Estimates Segments Segment Reporting Policy Policy [Text Block] Cash, Cash Equivalents, and Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Investments Investment Policy [Text Block] Concentration of Credit Risk and Other Risks and Uncertainties Concentration Risk Credit Risk Property and Equipment, Net Property Plant And Equipment Policy [Text Block] Impairment of Long-Lived Assets Impairment Or Disposal Of Long Lived Assets Policy [Text Block] Convertible preferred stock. Convertible Preferred Stock Convertible Preferred Stock Policy [Text Block] Research and Development Expenses Research And Development Expense Policy Accrued research and development expenses. Accrued Research and Development Expenses Accrued Research And Development Expenses Policy [Text Block] Patent costs. Patent Costs Patent Costs Policy [Text Block] Stock-based compensation Compensation Related Costs Policy [Text Block] Leases Lessee Leases Policy [Text Block] Income Taxes Income Tax Policy [Text Block] Comprehensive Loss Comprehensive Income Policy Policy [Text Block] Net Loss Per Share Earnings Per Share Policy [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Schedule of useful lives of property and equipment. Summary of Useful Lives of Property and Equipment Schedule Of Useful Lives Of Property And Equipment Table [Text Block] Summary of Fair Value of Financial Assets Consist of Investments Measured and Recognized at Fair Value Schedule Of Available For Sale Securities Reconciliation Table [Text Block] Summary of Property and Equipment, Net Property Plant And Equipment [Text Block] Schedule of Undiscounted Future Non-cancellable Lease Payments Under Operating Leases Lessee Operating Lease Liability Maturity Table [Text Block] Schedule of prepaid expenses and other current asset. Summary of Prepaid Expenses and Other Current Assets Schedule Of Prepaid Expenses And Other Current Assets Table [Text Block] Summary of Accrued Expense and Other Current Liabilities Schedule Of Accrued Liabilities Table [Text Block] Schedule of Series A Convertible Preferred Stock Schedule Of Stock By Class [Text Block] Summary of Stock-Based Compensation Expense Recorded in Condensed Statements of Operations and Allocated Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Summary of Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Fair Value of Stock Options Estimated using Weighted-Average Assumptions Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of Computation of Basic and Diluted Net Loss Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Class Of Stock [Line Items] Class Of Stock [Line Items] Forward stock split ratio Stockholders Equity Note Stock Split Conversion Ratio1 Stock issued during period in connection with underwriters exercise of option to purchase additional shares. Initial public offering, price per share Sale Of Stock Price Per Share Shares issued in connection with underwriters exercise of option to purchase additional shares Stock Issued During Period In Connection With Underwriters Exercise Of Option To Purchase Additional Shares Preferred stock converted to common stock Proceeds from IPO net of underwriting discounts and commissions and offering costs Cash, cash equivalents, restricted cash, and investments. Cash, cash equivalents, restricted cash, and investments Cash Cash Equivalents Restricted Cash And Investments Summary of significant accounting policies. Summary of significant accounting policies. Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Stand-by Letter of Credit Standby Letters Of Credit [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Number of reportable segments Number Of Reportable Segments Number of operating segments Number Of Operating Segments Debt securities, realized gain (loss) Debt Securities Realized Gain Loss Debt securities, continuous unrealized loss position, 12 months or longer Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Laboratory Equipment Equipment [Member] Furniture and Fixtures Furniture And Fixtures [Member] Leasehold Improvements Leasehold Improvements [Member] Computer Equipment Computer Equipment [Member] Property Plant And Equipment [Line Items] Property Plant And Equipment [Line Items] Useful lives of property and equipment Property Plant And Equipment Useful Life Useful lives of property and equipment Property Plant And Equipment Estimated Useful Lives Impairment of long-lived assets Impairment Of Long Lived Assets To Be Disposed Of Right-of-use asset Lease liabilities Deferred offering costs Deferred Offering Costs Issued nonconvertible debt. Market value of its stock held by non-affiliates. Total annual gross revenues Revenues Issued nonconvertible debt Issued Nonconvertible Debt Market value of its stock held by non-affiliates Market Value Of Its Stock Held By Non Affiliates Stable net asset value. Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 3 Fair Value Inputs Level3 [Member] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Stable net asset value Stable Net Asset Value Financial instruments classified as Level 3 Available For Sale Securities Debt Securities Available For Sale Securities Fair Value To Amortized Cost Basis [Abstract] Debt Securities Available For Sale [Table] Debt Securities Available For Sale [Table] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Asset Backed Securities Asset Backed Securities [Member] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Money Market Funds Money Market Funds [Member] Corporate Notes Corporate Note Securities [Member] Commercial Paper Commercial Paper [Member] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Schedule Of Available For Sale Securities [Line Items] Schedule Of Available For Sale Securities [Line Items] Amortized Cost Available For Sale Debt Securities Amortized Cost Basis Gross Unrealized Gains Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Gross Unrealized Losses Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Fair Value Investments Investments Computers. Computers Computers [Member] Lab Equipment Construction in Progress Construction In Progress [Member] Total property and equipment, gross Property Plant And Equipment Gross Less: accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Total property and equipment, net Depreciation expense Lessee Lease Description [Table] Lessee Lease Description [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] California C A Counterparty Name Counterparty Name [Axis] Counterparty Name Repurchase Agreement Counterparty Name [Domain] Level Home, Inc. Level Home, Inc. Level Home Inc [Member] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Operating lease, term of contract Lessee Operating Lease Term Of Contract Operating sublease term of contract. Operating sublease, term of contract Operating Sublease Term Of Contract Monthly rental payment Short Term Lease Payments Lessee, operating lease, lease not yet commenced, monthly lease payments. Lessee, operating lease, lease not yet commenced, rate of annual increases to rent. Operating lease, lease not yet commenced, term of contract Lessee Operating Lease Lease Not Yet Commenced Term Of Contract1 Operating lease, lease not yet commenced, monthly lease payments Lessee Operating Lease Lease Not Yet Commenced Monthly Lease Payments Operating lease, lease not yet commenced, rate of annual increases to rent Lessee Operating Lease Lease Not Yet Commenced Rate Of Annual Increases To Rent Operating lease, liability Operating Lease Liability Operating lease, weighted average discount rate Operating Lease Weighted Average Discount Rate Percent Operating lease, weighted average remaining lease term Operating Lease Weighted Average Remaining Lease Term1 Total rent payment Lease And Rental Expense Operating lease expense Operating Lease Expense Operating Lease Liabilities Payments Due [Abstract] 2021 (remaining three months) Lessee Operating Lease Liability Payments Remainder Of Fiscal Year 2022 Lessee Operating Lease Liability Payments Due Next Twelve Months 2023 Lessee Operating Lease Liability Payments Due Year Two 2024 Lessee Operating Lease Liability Payments Due Year Three 2025 Lessee Operating Lease Liability Payments Due Year Four Thereafter Lessee Operating Lease Liability Payments Due After Year Four Total undiscounted lease payments Lessee Operating Lease Liability Payments Due Less: Present value adjustments Lessee Operating Lease Liability Undiscounted Excess Amount Present value of lease payments Prepaid Expense And Other Assets Current [Abstract] Prepaid expenses Prepaid Expense Current Other current asset Other Assets Current Interest receivable Interest Receivable Current Security deposits Deposits Assets Current Total prepaid expenses and other current assets Accrued research and development materials and services. Accrued Liabilities Current [Abstract] Accrued research and development materials and services Accrued Research And Development Materials And Services Accrued professional services Accrued Professional Fees Current Accrued personnel expenses Employee Related Liabilities Current Other liabilities Other Liabilities Current Total accrued expenses and other current liabilities Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Restricted Stock Restricted Stock [Member] Shares authorize for issuance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Common stock shares outstanding including unvested restricted shares of common stock subject to repurchase. Common stock, shares outstanding Common Stock Shares Outstanding Including Unvested Restricted Shares Of Common Stock Subject To Repurchase Unvested restricted shares of common stock Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Options to purchase common stock outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Dividends declared Dividends Payable Current And Noncurrent Convertible preferred stock, shares issued Convertible preferred stock par value Proceeds from issuance of convertible preferred stock Proceeds From Issuance Of Convertible Preferred Stock Convertible preferred stock, shares outstanding Original issue price Temporary Equity Liquidation Preference Per Share Carrying value Liquidation preference Temporary Equity Liquidation Preference Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Two thousand and twenty equity incentive plan member. 2020 Equity Incentive Plan Two Thousand And Twenty Equity Incentive Plan [Member] Title of Individual Title Of Individual [Axis] Title of Individual Title Of Individual With Relationship To Entity [Domain] employees and non-employees Employees and Non-Employees Employees And Non Employees [Member] Two thousand and twenty one equity incentive plan. 2021 Equity Incentive Plan Two Thousand And Twenty One Equity Incentive Plan [Member] Scenario Statement Scenario [Axis] Scenario Scenario Unspecified [Domain] Forecast Scenario Forecast [Member] Two thousand and twenty one employee stock purchase plan. 2021 Employee Stock Purchase Plan Two Thousand And Twenty One Employee Stock Purchase Plan [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Reserved shares of common stock to grant stock-based compensation awards Common Stock Capital Shares Reserved For Future Issuance Options granted expiration period Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Share based compensation arrangement by share based payment award percentage of increment with prior year. Share-based compensation arrangement by share-based payment award, percentage of increment based on prior year Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Increment With Prior Year Common shares available for purchase. Discounted percentage for employees and designated affiliates to purchase common stock Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Offering Date Common shares available for purchase Common Shares Available For Purchase Stock options outstanding Expected dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Research and Development Research And Development Expense [Member] General and Administrative General And Administrative Expense [Member] Total stock-based compensation expense Allocated Share Based Compensation Expense Shares, Beginning Balance Shares, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Shares, Exercised Shares, Cancelled Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Shares, Ending Balance Shares, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted Average Exercise Price, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted Average Exercise Price, Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted Average Exercise Price, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted Average Exercise Price, Cancelled Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Weighted Average Exercise Price, Ending Balance Weighted Average Exercise Price, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted Average Remaining Contract Term Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted Average Remaining Contract Term, Exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract] Expected term in years Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Expected volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Risk-free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Weighted average fair value of share-based awards granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Restricted stock awards granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Vested restricted stock awards Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Unvested restricted awards Monthly principal and interest payments deferral period. Debt Instrument [Table] Debt Instrument [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Promissory note. Promissory Note Promissory Note [Member] Lender Name Line Of Credit Facility [Axis] Line of Credit Facility, Lender Line Of Credit Facility Lender [Domain] City National Bank. City National Bank City National Bank [Member] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Paycheck Protection Program loan. PPP Loan Paycheck Protection Program Loan [Member] Unusual Risk or Uncertainty, Nature Unusual Risk Or Uncertainty By Nature [Axis] Unusual Risk or Uncertainty, Nature Unusual Risk Or Uncertainty Nature [Domain] CARES Act. CARES Act C A R E S Act [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Loan amount Debt Instrument Face Amount Loan term Debt Instrument Term Interest rate Debt Instrument Interest Rate Stated Percentage Monthly principal and interest payments deferral period Monthly Principal And Interest Payments Deferral Period Prepayment penalties Payments Of Debt Extinguishment Costs Amount invested in exchange of common stock shares. Number of common stock shares exchanged. Related party transaction expenses paid by related party. Schedule Of Related Party Transactions By Related Party [Table] Schedule Of Related Party Transactions By Related Party [Table] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] A2A Pharmaceuticals and Biomea Health, LLC. A2A Pharmaceuticals and Biomea Health, LLC A2 A Pharmaceuticals And Biomea Health L L C [Member] Biomea Health, LLC. Biomea Health, LLC Biomea Health L L C [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Amount invested in exchange of common stock shares Amount Invested In Exchange Of Common Stock Shares Number of common stock shares exchanged Number Of Common Stock Shares Exchanged Expenses paid Related Party Transaction Expenses Paid By Related Party Outstanding receivable balance Due From Related Parties Numerator: Net Income Loss [Abstract] Net loss attributable to common stockholders, basic and diluted Denominator: Weighted Average Number Of Shares Outstanding Diluted Disclosure Items [Abstract] Weighted-average common shares outstanding Net loss per share attributable to common stockholders: Earnings Per Share Basic And Diluted [Abstract] Basic and diluted