Cover [Abstract] 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 Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Address, State or Province Entity Address, State or Province Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Shell Company Entity Shell Company Trading Symbol Trading Symbol Title of 12(b) Security Title of 12(b) Security Security Exchange Name Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Ex Transition Period Statement of Financial Position [Abstract] Liabilities and Equity [Abstract] Liabilities, Convertible Preferred Stock and Stockholders' Deficit Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses Total Operating Lease, Liability, Current Operating lease liabilities Current operating lease liabilities Liabilities, Current Total current liabilities Long-term Debt, Current Maturities Notes payable, net of discount Less: Current portion of long-term debt Contract with Customer, Liability, Current Deferred revenue Long-term Debt, Excluding Current Maturities Notes payable, net of discount and current portion Long-term debt, net of discount and current portion Operating Lease, Liability, Noncurrent Operating lease liabilities, net of current portion Preferred Stock Warrants Liability Preferred stock warrant liability The carrying value as of the balance sheet date of obligations related to preferred stock warrants. Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies (Note 10) Liabilities and Equity Total liabilities, convertible preferred stock and stockholders' deficit Temporary Equity, Carrying Amount, Attributable to Parent Convertible preferred stock (Series A-1, A-2 and B), $0.0001 par value; 43,296,288 and 28,629,622 shares authorized at September 30, 2020 and December 31, 2019, respectively; 40,623,413 and 28,615,546 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively; liquidation preference of $176,841 at September 30, 2020 Contract with Customer, Liability, Noncurrent Deferred revenue, net of current portion Stockholders' Equity Attributable to Parent [Abstract] Stockholders' deficit: Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Retained earnings accumulated deficit Stockholders' Equity Attributable to Parent Total stockholders' deficit Beginning balance Ending balance Common Stock, Value, Issued Common stock, $0.0001 par value; 62,000,000 and 46,600,000 shares authorized at September 30, 2020 and December 31, 2019, respectively; 6,244,154 and 5,762,745 shares issued and 6,021,177 and 4,870,851 shares outstanding at September 30, 2020 and December 31, 2019, respectively Assets [Abstract] Assets Restricted Cash, Noncurrent Restricted cash Other Assets, Noncurrent Other assets Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Assets Total assets Property, Plant and Equipment, Net Property and equipment, net Assets, Current [Abstract] Current assets: Assets, Current Total current assets Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Restricted Cash, Current Restricted cash Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents Deferred Costs, Noncurrent Deferred offering costs Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Convertible Preferred Stock [Member] Convertible Preferred Stock [Member] Statement [Line Items] Temporary Equity, Par or Stated Value Per Share Convertible Preferred Stock, Par Value Per Share Temporary Equity, Shares Authorized Convertible Preferred Stock, Shares Authorized Temporary Equity, Shares Issued Convertible Preferred Stock, Shares Issued Temporary Equity, Shares Outstanding Convertible Preferred Stock, Shares Outstanding Beginning balance (Shares) Ending balance (Shares) Temporary Equity, Liquidation Preference Convertible Preferred Stock, Liquidation Preference Common Stock, Shares Authorized Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Shares issued under agreement Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Beginning balance (Shares) Ending balance (Shares) Common Stock, Par or Stated Value Per Share Common Stock, Par Value Per Share Common stock, par value per share Income Statement [Abstract] Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development General and Administrative Expense General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Nonoperating Income (Expense) [Abstract] Other income (expense): Interest Expense Interest expense Interest Income And Other Income Expense Interest income and other income (expense), net Amount of interest income and income (expense) related to nonoperating activities, classified as other. Fair Value Adjustment of Warrants Change in fair value of preferred stock warrant liability Change in fair value of preferred stock warrant liability Nonoperating Income (Expense) Total other income (expense), net Net Income (Loss) Attributable to Parent Net loss and comprehensive loss Net loss Net income (loss) Earnings Per Share, Basic and Diluted Net loss per share attributable to common stockholders—basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average common shares outstanding—basic and diluted Revenue from Contract with Customer, Excluding Assessed Tax Collaboration revenue Revenue Statement of Stockholders' Equity [Abstract] Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Beginning balance Ending balance Temporary Equity, Stock Issued During Period, Value, New Issues Issuance of Series B convertible preferred stock, net of issuance costs Sale of preferred stock Temporary Equity Stock Issued During Period Shares New Issues Issuance of Series B convertible preferred stock, net of issuance costs, shares The number of shares of new stock classified as temporary equity issued during the period. Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock upon exercise of stock options APIC, Share-based Payment Arrangement, Increase for Cost Recognition Stock-based compensation expense Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Issuance of common stock upon exercise of stock options , shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Vesting of restricted stock, shares Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Vesting of restricted stock Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Accumulated Deficit Equity [Abstract] Series B Redeemable Convertible Preferred Stock [Member] Series B Convertible Preferred Stock [Member] Stock Issuance Costs Stock Issuance Costs Costs incurred directly with the issuance of an equity or temporary equity security. Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss 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: Depreciation, Depletion and Amortization Depreciation and amortization expense Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss on disposal of property and equipment Share-based Payment Arrangement, Noncash Expense Stock-based compensation expense Paid-in-Kind Interest Noncash interest expense Increase Decrease In Operating Lease Right Of Use Asset Noncash lease expense Amount of increase (decrease) in right-of-use assets under an operating lease. Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued expenses and other current liabilities Increase Decrease In Operating Lease Liabilities Operating lease liabilities The increase (decrease) in operating lease liabilities during the reporting period. Increase (Decrease) in Contract with Customer, Liability Deferred revenue Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of property and equipment Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from issuance of convertible preferred stock, net of issuance costs Proceeds from Stock Options Exercised Proceeds from issuance of common stock upon exercise of stock options Payments of Debt Issuance Costs Payment of notes payable issuance costs Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Repayments of Notes Payable Repayment of notes payable Payments of Stock Issuance Costs Payment of initial public offering costs Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at end of period Supplemental Cash Flow Information [Abstract] Supplemental cash flow information: Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for interest Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental disclosure of noncash investing and financing information: Capital Expenditures Incurred but Not yet Paid Purchases of property and equipment included in accounts payable and accrued expenses Deferred Offering Costs Included In Accounts Payable and Accrued Expenses Deferred offering costs included in accounts payable and accrued expenses Deferred offering costs included in accounts payable and accrued expenses. Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Reconciliation of cash, cash equivalents and restricted cash: Restricted Cash Restricted cash (current and non-current) Accounting Policies [Abstract] Business Description and Basis of Presentation [Text Block] Nature of Business and Basis of Presentation Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Fair Value Disclosures [Abstract] Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31) Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Fair Value Measurements Payables and Accruals [Abstract] Accrued expenses [Abstract] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses Debt Disclosure [Abstract] Debt Disclosure [Text Block] Notes Payable Stockholders' Equity Note [Abstract] Convertible Preferred Stock [Abstract] Stockholders' Equity Note Disclosure [Text Block] Convertible Preferred Stock Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Text Block] Stock-Based Compensation Disclosure Text Block [Abstract] Collaborative Arrangement Disclosure [Text Block] Collaboration Agreement Leases [Abstract] Leases [Abstract] Lessee, Operating Leases [Text Block] Leases Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Retirement Benefits [Abstract] Retirement Benefits [Text Block] Defined Contribution Plan Related Party Transactions [Abstract] Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Parties Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events Use of Estimates, Policy [Policy Text Block] Use of estimates Deferred Offering Cost [Policy Text Block] Deferred offering costs Disclosure of accounting policy for deferred offering costs. Property, Plant and Equipment, Policy [Policy Text Block] Property and equipment Fair Value Measurement, Policy [Policy Text Block] Fair value measurements Revenue from Contract with Customer [Policy Text Block] Revenue recognition Earnings Per Share, Policy [Policy Text Block] Net loss per share New Accounting Pronouncements, Policy [Policy Text Block] Recently issued accounting pronouncements Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentrations of credit risk and of significant suppliers Basis of Accounting, Policy [Policy Text Block] Basis of presentation Property, Plant and Equipment [Table Text Block] Summary of Property and Equipment are Stated at Cost Less Accumulated Depreciation and Amortization Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Summary of Earnings Per Share Diluted Anti Dilutive Impact 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 Schedule of Accrued Liabilities [Table Text Block] Accrued Expenses Long-term Debt, Unclassified [Abstract] Schedule of Long-term Debt Instruments [Table Text Block] Summary of Long Term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Summary of Future Long Term Loan Principal Payments Due Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Summary of Stock-Based Compensation Expense Lease, Cost [Table Text Block] Summary of Lease Cost Schedule Of Supplemental Cash Flow Information Related To Leases [Table Text Block] Summary of Supplemental Cash Flow Information Related to Leases Tabular disclosure of supplemental information for the statement of cash flows related to leases. Schedule Of WeightedAverage Remaining Lease Term And Discount Rate [Table Text Block] Summary of Weighted-Average Remaining Lease Term and Discount Rate Leases Tabular disclosure of the weighted average remaining lease term and weighted average discount rate related to leases. Lessee, Operating Lease, Liability, Maturity [Table Text Block] Summary of Minimum Lease Payments Operating Lease Liability [Table Text Block] Summary of Operating Lease Liabilities Tabular disclosure of operating lease liabilities included in the consolidated balance sheet. Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization Consolidation And Presentation Of Financial Statements [Table] Organization Consolidation And Presentation Of Financial Statements [Table] Organization consolidation and presentation of financial statements. Organization Consolidation And Presentation Of Financial Statements [Line Items] Organization Consolidation And Presentation Of Financial Statements [Line Items] Organization consolidation and presentation of financial statements. Stock Issued During Period, Shares, New Issues Stock issued during the period shares new issues shares Sale of Stock, Price Per Share Sale of stock issue price per share Sale of Stock, Consideration Received on Transaction Sale of stock consideration received on the transaction Proceeds From Upfront Payment Upfront payment received from Merck Proceeds from upfront payment Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] IPO [Member] IPO [Member] Over-Allotment Option [Member] Over-Allotment Option [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Deferred Offering Costs Deferred offering costs Capitalized Costs Not Placed In Service Capitalized costs The amount of capitalized costs related to leasehold improvements that have not yet been placed in service and for which depreciation has not yet begun. Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Useful Life Property, plant and equipment, useful life Property, Plant and Equipment, Estimated Useful Lives Property, plant and equipment, useful life Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Domain] Furniture and Fixtures [Member] Furniture and fixtures [Member] Software and Software Development Costs [Member] Computer equipment and software [Member] Equipment [Member] Laboratory equipment [Member] Leasehold Improvements [Member] Leasehold improvements [Member] Earnings Per Share Diluted Anti Dilutive Impact [Abstract] Warrant [Member] Restricted Stock [Member] Share-based Payment Arrangement, Option [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value, Recurring and Nonrecurring [Table] FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasis[Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems Cash and Cash Equivalents, Fair Value Disclosure Money market funds Financial Liabilities Fair Value Disclosure Preferred stock warrant liability Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Level 1 [Member] Fair Value, Inputs, Level 3 [Member] Level 3 [Member] Measurement Frequency [Axis] Measurement Frequency [Domain] Fair Value, Recurring [Member] Fair Value, Recurring [Member] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Money Market Funds [Member] Money Market Funds [Member] Financial Instrument [Axis] Financial Instruments [Domain] Preferred Stock Warrant Liability [Member] Preferred Stock Warrant Liability [Member] Preferred Stock Warrant Liability Warrant Issue Price Warrant issue price Warrant Issue Price Class of Warrant or Right, Number of Securities Called by Warrants or Rights Class of warrant or right, number of securities called by warrants or rights Warrants granted to purchase common stock Accrued Research And Development Expenses Accrued external research and development expenses Carrying value as of the balance sheet date of obligations incurred through that date and payable for expenses related to research and development. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Construction Payable, Current Accrued construction in progress Employee-related Liabilities, Current Accrued employee compensation and benefits Other Accrued Liabilities, Current Other Long Term Debt Noncurrent Before Debt Discount And Accrued Payments Long-term debt, net of current portion Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, excluding current portion. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Debt Instrument, Unamortized Discount Debt discount, net of accretion Long-term Debt, Gross Principal amount of long-term debt Long-term Debt, Gross Debt instrument carrying amount Debt instrument loan amount Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid Final payment fee Long-term Debt, Fiscal Year Maturity [Abstract] Long-Term Debt, Maturity, Remainder of Fiscal Year Remainder of 2020 (three months) Long-Term Debt, Maturity, Year One 2021 Long-Term Debt, Maturity, Year Two 2022 Long-Term Debt, Maturity, Year Three 2023 Schedule of Short-term Debt [Table] Debt Instrument [Axis] Debt Instrument, Name [Domain] Term Loan A [Member] Term Loan A [Member] Term Loan B [Member] Term Loan B [Member] Short-term Debt [Line Items] Debt Instrument, Description of Variable Rate Basis Debt instrument, description of variable rate basis Debt Instrument, Basis Spread on Variable Rate Debt instrument, basis spread on variable rate Debt Instrument, Interest Rate, Stated Percentage Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Effective Percentage Debt instrument, interest rate, effective percentage Interest rate outstanding borrowings Loan Interest rate outstanding borrowings loan The interest rate applicable to outstanding borrowings under the Loan. Long-term Debt, Weighted Average Interest Rate, over Time Debt, weighted average interest rate Debt Instrument Periodic Payment Terms Balloon Payment To Be Paid Percentage Debt, final payment fee percentage Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt, as a percentage of the amounts drawn under the Term Loan. Debt Instrument, Covenant Description Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Additional Rate In Event Of Default [Member] Additional Over Base Rate [Member] Statistical Measurement [Axis] Statistical Measurement [Domain] Minimum [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Oxford Finance LLC [Member] Oxford Finance LLC [Member] Oxford finance llc. Shares Issued, Price Per Share Preferred stock, par or stated value per share Proceeds from Issuance of Convertible Preferred Stock Proceeds from issuance of convertible preferred stock Conversion of Stock, Shares Issued Conversion of preferred stock, common shares issued Auction Market Preferred Securities, Stock Series [Axis] Auction Market Preferred Securities, Stock Series, Title [Domain] Series B [Member] Income Statement Location [Axis] Income Statement Location [Domain] Research and Development Expense [Member] Research and Development Expenses [Member] General and Administrative Expense [Member] General and Administrative Expenses [Member] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Plan Name [Axis] Plan Name [Domain] Two Thousand sixteen Stock incentive plan [Member] 2016 Stock incentive plan [Member] Two thousand sixteen stock incentive plan. Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-based Payment Arrangement [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Common stock shares available for grant Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Unrecognized compensation costs related to unvested options and unvested restricted stock Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Weighted average period of unrecognized compensation costs Collaboration Agreement [Abstract] Collaboration Agreement Contract with Customer, Liability Deferred revenue Milestone Receivable Upon Achievement Amount receivable for achievement of milestones The amount of consideration to be received upon achievement of specified milestones. Revenue, Remaining Performance Obligation, Amount Unsatisfied portion of the performance obligation Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type [Domain] Merck Collaboration Agreement [Member] Merck Collaboration Agreement [Member] Merck collaboration agreement. Research Development And Regulatory [Member] Research Development And Regulatory [Member] Research development and regulatory. Maximum [Member] Sales [Member] Sales based [Member] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lease Contractual Term [Axis] Lease Contractual Term [Axis] Lease Contractual Term [Domain] Lease Contractual Term [Domain] New Lease Agreement [Member] New Lease Agreement [Member] New lease agreement [Member]. Modified New Lease Agreement [Member] Modified New Lease Agreement [Member] Modified new lease agreement [Member]. Property Under Operating Lease Subleased [Member] Property Under Operating Lease Subleased [Member] Property under operating lease subleased [Member]. Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] MASSACHUSETTS Massachusetts [Member] Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Domain] Property Subject to or Available for Operating Lease [Domain] Office Building [Member] Office Building [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Area of Real Estate Property Area of leased property Lessee, Operating Lease, Term of Contract Operating lease term lessee gross Lessee, Operating Lease, Renewal Term Operating lease term extension Operating Lease, Expense Operating lease rent payments Leasehold Improvements Landlord Allowance Leasehold improvements landlord allowance The monetary allowance granted by the landlord to a tenant to entice tenant to move into landlord's building which will enable the tenant to prepare the leased premises for tenant's occupancy. Operating Lease, Liability Operating lease liability Total operating lease liabilities Total operating lease liabilities Term Of Property Subleased Under Operating Lease Term of property subleased under operating lease Term of property subleased under operating lease. Leasehold Improvements Landlord Allowance To Be Repaid Leasehold improvements landlord allowance to be repaid An additional monetary allowance granted by the landlord to a tenant to entice tenant to move into landlord's building which will enable the tenant to prepare the leased premises for tenant's occupancy. This additional amount will result in additional rent payments to the landlord. Payments for (Proceeds from) Tenant Allowance Reimbursements from lessor Change In Operating Lease Liability Right Of Use Asset Remeasurement Increase in operating lease liabilities and right-of-use assets due to lease remeasurement The increase (decrease) in the operating lease liability and right of use asset as the result of a lease remeasurement. Operating Leases Future Minimum Payments Receivable Sublease Rentals Operating lease sublease rental income The amount of remaining base rent payments receivable from the sub-lessee over the sublease term. Lease Term Commencement Date Lease term commencement date Lease term commencement date. Other Income Sublease income recorded as other income Scenario [Axis] Scenario [Domain] Forecast [Member] Operating Lease, Cost Operating lease cost Lease, Cost Total Variable Lease, Cost Variable lease cost Short-term Lease, Cost Short-term lease cost Operating Lease, Payments Cash paid for amounts included in the measurement of operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating lease liabilities arising from obtaining right-of-use assets Schedule Of Weighted Average Remaining Lease Term And Discount Rate [Abstract] Schedule Of WeightedAverage Remaining Lease Term And Discount Rate [Abstract] Schedule of weighted-average remaining lease term and discount rate [Abstract]. Operating Lease, Weighted Average Remaining Lease Term Weighted-average remaining lease term - operating leases Operating Lease, Weighted Average Discount Rate, Percent Weighted-average discount rate - operating leases Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Remainder of 2020 (three months) Lessee, Operating Lease, Liability, to be Paid, Year One 2021 Lessee, Operating Lease, Liability, to be Paid, Year Two 2022 Lessee, Operating Lease, Liability, to be Paid, Year Three 2023 Lessee, Operating Lease, Liability, to be Paid, Year Four 2024 Lessee Operating Lease Liability Payments Due After Year Four Thereafter Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Lessee, Operating Lease, Liability, to be Paid Total future minimum lease payments Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: imputed interest Lessee Operating Lease Liability Estimated Lease Incentives Less: estimated lease incentives Amount of estimated lease incentives used by lessee to determine present value of operating lease payments. Operating Lease, Liability [Abstract] Operating Lease, Liability [Abstract] Non Refundable License Fee Non-refundable license fee Non-refundable license fee Reimbursed Patent Costs Reimbursed patent costs The amount paid by the Company to reimburse the licensor for costs incurred related to patented technology. Milestones Payable Upon Event Milestones payable upon event The amount the Company will pay for regulatory milestones on each licensed product upon the occurrence of specific events as outlined in the license agreement. Annual License Maintenance Fees Annual license maintenance fees Annual license maintenance fees. Stanford License Agreement [Member] Exercise Price Range [Axis] Exercise Price Range [Domain] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Line Items] Service agreement term Service agreement term The term of a service agreement in 'PnYnMnDTnHnMnS' format. Cash Payments Related Party Payments made to related party under service agreement Cash payments made during the period to related parties as part of a service or consulting agreement. Agreements [Axis] Agreements. Agreements [Domain] Agreements. Flagship Pioneering [Member] Flagship Pioneering. Scientific Founder [Member] Scientific Founder. Subsequent Event [Table] Subsequent Event [Line Items] Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Par or Stated Value Per Share Preferred stock, par or stated value per share Shares Authorized Shares authorized The maximum number of shares permitted to be issued by an entity's charter and bylaws, consisting of all classes of stock. Stockholders' Equity, Reverse Stock Split Reverse stock split Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum Annual increase of shares Debt Instrument, Interest Rate During Period Debt instrument interest rate Debt Instrument, Interest Rate Terms Debt instrument interest terms Debt Instrument, Maturity Date Debt instrument maturity date Debt Instrument, Payment Terms Debt instruments payment terms Debt Instrument, Frequency of Periodic Payment Debt instrument frequency of payment terms Debt Instrument, Restrictive Covenants Debt instrument, restrictive covenants Proceeds from Issuance of Debt Proceeds from issuance of debt Warrants Issue Price Per Share Warrants Issue Price Per Share Per unit amount of warrant issued. Warrants and Rights Outstanding, Term Warrants exercisable term Two Thousand Twenty Equity Incentive Plan [Member] 2020 Incentive Plan [Member] Two Thousand Twenty Employee Stock Purchase Plan [Member] 2020 Employee Stock Purchase Plan [Member] Initial Amount [Member] Initial Aggregate From Two Thousand Sixteen And Two Thousand Twenty Plans [Member] Initial Aggregate From 2016 And 2020 Plans [Member]