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Issuance of Series B-1 Preferred Stock, net of issuance costs of $49, Shares Temporary Equity Stock Issued During Period Shares New Issues Temporary equity stock issued during period shares new issues. Billed accounts receivable Billed Contracts Receivable Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Exercised Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Preferred stock premium Preferred Stock Issuance Premium Preferred stock issuance premium. Fair value of available-for-sale debt securities, contractual maturity of less than 12 months Fair Value Of Available For Sale Debt Securities Contractual Maturity Of Less Than Twelve Months Fair value of available-for-sale debt securities contractual maturity of less than twelve months. 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Statement of Cash Flows [Abstract] Comprehensive Loss Comprehensive Income, Policy [Policy Text Block] Earliest Tax Year Earliest Tax Year [Member] Income Tax Authority Income Tax Authority [Domain] Organization, Consolidation and Presentation of Financial Statements [Abstract] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Document Annual Report Document Annual Report Accounts receivable and contract assets, Deductions Contract With Customer Asset Net Deductions Contract with customer asset net deductions. 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Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Initial research term of collaboration Initial Research Term Of Collaboration Initial research term of collaboration. Document Financial Statement Error Correction [Flag] Contract Liabilities, Deductions Contract With Customer Liability Deductions Contract with customer liability deductions. Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders Anti-Diluted Effect Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Premiums And Discounts On Available For Sale Marketable Securities Premiums and discounts on available for sale marketable securities. 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Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance General and administrative General and Administrative Expense General and Administrative Expense, Total Grantee Status Grantee Status [Axis] Description of Business and Summary of Significant Accounting Policies Business Description and Accounting Policies [Text Block] Convertible Preferred Stock, liquidation preference Temporary Equity, Liquidation Preference Weighted Average Number of Shares Outstanding, Basic, Total Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding, basic Vertex Agreement Vertex Agreement [Member] Vertex Agreement. Research and Development Arrangement, Contract to Perform for Others, Type Research and Development Arrangement, Contract to Perform for Others, Type [Domain] Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Research and Development Costs Research and Development Expense, Policy [Policy Text Block] Sanofi Agreement Sanofi Collaboration Arrangement [Member] Sanofi collaboration arrangement. Statement [Table] Statement [Table] Summary of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Cash and Cash Equivalents Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block] Summary of Weighted-Average Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Deferred revenue Increase (Decrease) in Contract with Customer, Liability Document Fiscal Period Focus Document Fiscal Period Focus Total minimum lease payments Lessee, Operating Lease, Liability, to be Paid Billed Receivables - Sanofi Billed Receivables Sanofi [Member] Billed receivables - Sanofi. Series B Convertible Preferred Stock Series B Convertible Preferred Stocks [Member] Series B convertible preferred stock. Milestones Received Amount Milestones Received Amount Milestones Received Amount Related Party Transactions Related Party Transactions Disclosure [Text Block] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Vertex Pharmaceuticals Incorporated Vertex Pharmaceuticals Incorporated [Member] Vertex Pharmaceuticals Incorporated. Professional fees Accrued Professional Fees, Current Statement [Line Items] Statement [Line Items] Payments on financing leases Payments of Financing Costs Payments of Financing Costs, Total Anti-dilutive stock Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Total lease costs Lease, Cost Subsequent Event [Line Items] Description Of Business And Summary Of Significant Accounting Policies [Abstract] Description of business and summary of significant accounting policies. landlord [Member] landlord [Member] Schedule of Significant Components of Net Deferred Income Taxes Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Accounts Receivable Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current, Total Common Stock Common Stock [Member] Revenue Recognition of Milestone Revenue Recognition, Milestone Method, Revenue Recognized Increase Decrease In Contract With Customer Asset Related Parties Increase (decrease) in contract with customer asset related parties. 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Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Liabilities accrued Loss Contingency Accrual Loss Contingency Accrual, Beginning Balance Loss Contingency Accrual, Ending Balance Antidilutive Securities, Name Antidilutive Securities, Name [Domain] ASU 2016-13 Accounting Standards Update 2016-13 [Member] Conversion of convertible preferred stock into common stock Stock Issued During Period, Value, Conversion of Convertible Securities Collaboration revenue from related party. Collaboration Revenues From Related Party [Member] Description Of Business And Summary Of Significant Accounting Policies [Table] Description Of Business And Summary Of Significant Accounting Policies [Table] Description of business and summary of significant accounting policies. Fair value assets, level 3 to level 2 transfers, amount Fair Value Assets Level3 To Level2 Transfers Amount Fair value assets level 3 to level 2 transfers amount. Cover Cover [Abstract] Number of securities decline in market value for in an unrealized loss position Debt Securities Available For Sale Decline In Market Value For Unrealized Loss Position Number Of Securities Debt securities available for sale decline in market value for unrealized loss position number of securities. Extended research term of collaboration Extended Research Term Of Collaboration Extended research term of collaboration. Document Fiscal Year Focus Document Fiscal Year Focus Supplemental disclosure of noncash operating activities Supplemental Disclosure Of Noncash Operating Activities [Abstract] Supplemental disclosure of noncash operating activities. Public Offering [Member] Public Offering [Member] Temporary Equity By Class Of Stock [Table] Temporary Equity, by Class of Stock [Table] Sale of Stock Sale of Stock [Domain] Lease additional term Lease Additional Term Lease additional term. Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Increase in accumulated deficit related to temporary equity deemed dividend Increase In Accumulated Deficit Related To Temporary Equity Deemed Dividend Increase in accumulated deficit related to temporary equity deemed dividend. Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Exchange of Series A Convertible Preferred Stock for Series C Preferred Convertible Preferred Stock Exchange Of Convertible Preferred Stock Impact On Equity Exchange of convertible preferred stock impact on equity. 2020 Plan Two Thousand And Twenty Stock Option And Grant Plan [Member] Two thousand and twenty stock option and grant plan. 2020 Plan Two Thousand And Twenty Plan [Member] Two thousand and twenty plan. Security Exchange Name Security Exchange Name Accounts Receivable Accounts Receivable [Policy Text Block] Federal Domestic Tax Authority [Member] Eligible to receive payments including development, regulatory and commercial milestones Potential Receivable Milestone Payments Potential receivable milestone payments. Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Preferred stock, shares issued Preferred Stock, Shares Issued Preferred Stock, Shares Issued, Total Preferred stock, shares authorized Preferred Stock, Shares Authorized Accounts receivable and contract assets, Additions Contract With Customer Asset Net Additions Contract with customer asset net additions. 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Unconstrained consideration Unconstrained Consideration Unconstrained Consideration Common Stock, outstanding Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Equity-Based Compensation Share-Based Payment Arrangement [Text Block] Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Increase of valuation allowance SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Right-of-use assets Deferred Tax Liabilities Right Of Use Assets Deferred tax liabilities right-of-use assets. Follow-on Offering Follow On Offering [Member] Follow-on offering. 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Marketable securities, non-current Marketable Securities, Noncurrent Marketable Securities, Noncurrent, Total Security deposit Security Deposit Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs Capitalized Research and Development Issuance of vested restricted stock to consultants, Share Issuance of Vested Restricted Stock to Consultants Issuance of vested restricted stock to consultants Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities 2020 ESPP Two Thousand Twenty Employee Stock Purchase Plan [Member] 2020 Employee stock purchase plan. 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Number of shares vested Segment and Geographic Information Segment And Geographic Information Policy [Text Block] Segment and geographic information. Accrued Liabilities, Current [Abstract] Purchase of marketable securities Payments to Acquire Marketable Securities Payments to Acquire Marketable Securities, Total Research and development expenses Accrued Research And Development Expenses Current Accrued research and development expenses current. Costs Associated with License and Collaborative Arrangements Costs Associated With License And Collaborative Arrangements Policy [Text Block] Costs associated with license and collaborative arrangements. Total liabilities Liabilities Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Total stockholders' equity Beginning Balance Ending Balance Equity, Attributable to Parent Consolidated Entities Consolidated Entities [Axis] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Net loss Proceeds from initial public offering, net of underwriting discounts and offering costs Proceeds from Issuance Initial Public Offering Contract assets-due from related party Contract with Customer, Asset, after Allowance for Credit Loss, Current Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total State taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Collaboration termination date. Collaboration Termination Date Collaboration termination date Written notice period to terminate collaboration agreement Written Notice Period To Terminate Collaboration Agreement Written notice period to terminate collaboration agreement. Issuance of Common Stock and accompanying Pre-Funded Warrants at Private Placement, net of issuance cost of $174 Issuance of Common Stock at Private Placement, net of issuance cost Issuance of Common Stock at Private Placement, net of issuance cost Financing Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Corporate Securities Corporate Debt Securities [Member] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Convertible Preferred Stock Preferred Stock [Text Block] Compound Collaboration Compound Collaboration Agreement [Member] Compound Collaboration Agreement. Statement of Financial Position [Abstract] Area of office space Area of Real Estate Property Number of marketable securities sold Number Of Marketable Securities Sold Number of marketable securities sold. Weighted Average Number of Shares Outstanding, Diluted, Total Weighted Average Number of Shares Outstanding, Diluted Weighted average common shares outstanding, diluted Rate Reconciliation of U.S. Statutory Income Tax Rate to Company's Effective Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Impairment losses on long-lived assets Impairment of Long-Lived Assets to be Disposed of Credit Facility Credit Facility [Axis] Total Effective Income Tax Rate Reconciliation, Percent Temporary Equity, Exchange of Series A Convertible Preferred Stock for Series C Preferred Convertible Preferred Stock Temporary Equity Exchange Of Convertible Preferred Stock Value Temporary equity, exchange of convertible preferred stock, value. 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Outstanding at beginning of period Outstanding at end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Summary of Basic and Diluted Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Leasehold Improvements Leasehold Improvements [Member] Income Tax Authority Income Tax Authority [Axis] Supplemental Cash Flow Information Relating to Leases Supplemental Cash Flow Information Relating To Leases Table [Text Block] Supplemental cash flow information relating to leases. Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] DebtSecuritiesAvailableForSale Continuous Unrealized Loss Position Greater Than 12 Months Number Of Positions DebtSecuritiesAvailableForSale Continuous Unrealized Loss Position Greater Than 12 Months Number Of Positions Number of available-for-sale debt securities, continuous unrealized loss position for greater than 12 months Annual increase percentage of rent Base Rent Annual Increase Over The Lease Term Base rent annual increase over the lease term. Fair Value Disclosures [Abstract] Maximum number of shares to be issued, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] 2026 Finance Lease, Liability, to be Paid, Year Three Measurement Frequency Measurement Frequency [Domain] Useful Life, Lease Term [Member] Purchase of property and equipment, net Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment, Total Interest expense for financing lease liabilities Finance Lease, Interest Expense Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Issuance of shares, Shares Stock Issued During Period, Shares, New Issues Common stock shares issued Milestones Revenue Recognized Collaboration revenue recognised Collaboration revenue recognised 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, Including Disposal Group and Discontinued Operations Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Maturities of marketable securities Proceeds from Sale and Maturity of Marketable Securities Proceeds from Sale and Maturity of Marketable Securities, Total Income Tax Disclosure [Abstract] Undiscounted Future Lease Payments Undiscounted Future Lease Payments Undiscounted Future Lease Payments NOL carryforwards Operating Loss Carryforwards Operating Loss Carryforwards, Total Accelerated Share Repurchases, Initial Price Paid Per Share Pre-funded warrants per share Payments of offering costs in connection with initial public offering Payments of offering costs in connection with initial public offering Payments for Repurchase of Initial Public Offering