Document Type Document Type Aggregate intrinsic value outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Issued (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued in Period Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Amortization of premiums and discounts on marketable securities, net Accretion (Amortization) of Discounts and Premiums, Investments Related Party [Axis] Related Party [Axis] Payables and Accruals [Abstract] Payables and Accruals [Abstract] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Available-for-Sale, Gross Unrealized Gain, Maturity of one to two years Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, Noncurrent, before Tax Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, Noncurrent, before Tax Marketable securities Available-for-sale, Estimated Fair Value Debt Securities, Available-for-sale Two Thousand Twenty Employee Stock Purchase Plan Two Thousand Twenty Employee Stock Purchase Plan [Member] Two Thousand Twenty Employee Stock Purchase Plan Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Proceeds from issuance or sale of equity Proceeds from Issuance or Sale of Equity Equity Components [Axis] Equity Components [Axis] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Restricted Stock Restricted Stock [Member] Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Level 3 Fair Value, Inputs, Level 3 [Member] Repurchase of Series C redeemable convertible preferred stock (in shares) Temporary Equity Shares Acquired Temporary equity shares acquired Operating lease liabilities Operating Lease, Liability, Current Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Forfeitures (in dollars per shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Schedule of fair value of stock option awards on the grant date using the Black-Scholes option valuation model Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Accrued consulting expenses Accrued Consulting Expenses, Current Accrued Consulting Expenses, Current Entity Interactive Data Current Entity Interactive Data Current Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Security Exchange Name Security Exchange Name Fair Value Measurements Fair Value Disclosures [Text Block] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Common Stock and Preferred Stock Stockholders' Equity Note Disclosure [Text Block] Summary of stock option activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Loss from operations Operating Income (Loss) Schedule Of Common Stock Reserved For Future Issuance [Line Items] Schedule Of Common Stock Reserved For Future Issuance [Line Items] Schedule Of Common Stock Reserved For Future Issuance Line items Total current liabilities Liabilities, Current Summary of common stock reserved for future issuance Schedule Of Common Stock Reserved For Future Issuance [Table Text Block] Schedule Of Common Stock Reserved For Future Issuance Entity Registrant Name Entity Registrant Name Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Unvested beginning balance (in dollars per share) Unvested ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Expense Reimbursement Expense Reimbursement [Member] Expense Reimbursement Available-for-Sale, Gross Unrealized Loss, Maturity of one year or less Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, Current, before Tax Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, Current, before Tax Issued (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued in Period, Weighted Average Grant Date Fair Value Commitments and contingencies (Note 6) Commitments and Contingencies Available-for-Sale, Estimated Fair Value, Maturity of one to two years Debt Securities, Available-for-sale, Noncurrent Assets Assets [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Accounts payable Accounts Payable, Current Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Research and development Research and Development Expense [Member] Gain on repurchase of redeemable convertible preferred stock Gain Loss On Repurchase Of Temporary Equity Gain Loss On Repurchase Of Temporary Equity Accumulated deficit Accumulated deficit Retained Earnings (Accumulated Deficit) Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Series B-1 Redeemable Convertible Preferred Stock Series B-1 Preferred Stock SeriesBOneRedeemableConvertiblePreferredStock [Member] Series B One Redeemable Convertible Preferred Stock. Reconciliation of cash, cash equivalents and restricted cash: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Accretion of redeemable convertible preferred stock to redemption value Temporary Equity, Accretion to Redemption Value, Adjustment Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Percentage Increase In Annual Base Rent Percentage Increase In Annual Base Rent Percentage Increase In Annual Base Rent. Available-for-sale, Gross Unrealized Loss Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Entity Address, Postal Zip Code Entity Address, Postal Zip Code Weighted average common shares outstanding, basic and diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued or outstanding as of March 31, 2021 and December 31, 2020 Preferred Stock, Value, Issued Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] U.S. government agency and treasury securities US Treasury and Government [Member] Total operating expenses Operating Expenses Document Transition Report Document Transition Report Number of shares exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Other income: Nonoperating Income (Expense) [Abstract] Stock-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Level 2 Fair Value, Inputs, Level 2 [Member] Related party transaction, amounts of transaction Related Party Transaction, Amounts of Transaction Document Quarterly Report Document Quarterly Report Canceled or forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Measurement Frequency [Domain] Measurement Frequency [Domain] Asset Class [Domain] Asset Class [Domain] General and administrative General and Administrative Expense [Member] Assets Assets, Fair Value Disclosure Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Repurchase of Series C redeemable convertible preferred stock Adjustment to Retained Earnings, Repurchase of Convertible Preferred Stock Adjustment to Retained Earnings, Repurchase of Convertible Preferred Stock Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Statement [Line Items] Statement [Line Items] Vested and expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Summary of antidilutive securities excluded from computation of earnings per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Class of Stock [Domain] Class of Stock [Domain] Unrealized losses on marketable securities, net of tax Unrealized Gain (Loss) on Investments Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Entity File Number Entity File Number Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Repurchase of Series C redeemable convertible preferred stock Payments for Repurchase of Redeemable Convertible Preferred Stock Statement [Table] Statement [Table] Non-cash operating lease expense Operating Lease, Right-of-Use Asset, Amortization Expense Preferred stock, issued (in shares) Preferred Stock, Shares Issued Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Series A Redeemable Convertible Preferred Stock Series A Preferred Stock Series A Redeemable Convertible Preferred Stock [Member] Debt securities issued by U.S. government agencies US Government Agencies Debt Securities [Member] Stock-based compensation expense Share-based Payment Arrangement, Expense Office Space in Cambridge Massachusetts Office Space in Cambridge Massachusetts [Member] Office Space in Cambridge Massachusetts. Interest income, net Interest Income, Other Denominator: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Available-for-Sale, Gross Unrealized Loss, Maturity of one to two years Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, Noncurrent, before Tax Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, Noncurrent, before Tax Common stock, $0.0001 par value; 150,000,000 shares authorized; 38,621,049 shares issued and outstanding as of March 31, 2021, and 38,268,543 shares issued and outstanding as of December 31, 2020 Common Stock, Value, Issued Marketable Securities Marketable Securities, Policy [Policy Text Block] Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Entity Small Business Entity Small Business Document Fiscal Year Focus Document Fiscal Year Focus Commercial paper Commercial Paper [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Aggregate intrinsic value exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Entity Current Reporting Status Entity Current Reporting Status Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Weighted average remaining contractual term exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Related Party Transaction [Axis] Related Party Transaction [Axis] Amendment Flag Amendment Flag Summary of basic and diluted net loss per share attributable to common stockholders Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Purchases of marketable securities Payments to Acquire Debt Securities, Available-for-sale Number of product candidates Number of product candidates Number of product candidates. Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Summary of financial assets measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Common stock, issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accrued other Other Accrued Liabilities, Current Shares reserved for future awards under the 2020 Stock Option and Incentive Plan Twenty Twenty Employee Stock Incentive Plan [Member] Twenty Twenty Employee Stock Incentive Plan Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Entity Central Index Key Entity Central Index Key Related Party [Domain] Related Party [Domain] Measurement Frequency [Axis] Measurement Frequency [Axis] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Marketable securities Debt Securities, Available-for-sale, Current Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Available-for-Sale, Gross Unrealized Gain, Maturity of one year or less Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, Current, before Tax Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, Current, before Tax Beginning balance Ending balance Temporary Equity, Carrying Amount, Attributable to Parent Financial Instruments [Domain] Financial Instruments [Domain] Statement of Comprehensive Income [Abstract] Total stockholders’ equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Nature of the Business Nature of Operations [Text Block] Payment of deferred offering costs Payments of Stock Issuance Costs Total liabilities and stockholders’ equity Liabilities and Equity Loss Contingencies [Line Items] Loss Contingencies [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Axis] Purchases of property, plant and equipment included in accounts payable Capital Expenditures Incurred but Not yet Paid Entity Address, City or Town Entity Address, City or Town Accrued personnel-related expenses Accrued Personnel Related Expenses Current Accrued Personnel Related Expenses, Current. Subsequent Events Subsequent Events [Text Block] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] General and administrative General and Administrative Expense Financial Instrument [Axis] Financial Instrument [Axis] Available-for-sale, Cost Debt Securities, Available-for-sale, Amortized Cost Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Unrecognized compensation expense related to unvested stock based awards Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Available-for-sale, Gross Unrealized Gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Entity Ex Transition Period Entity Ex Transition Period Equity Component [Domain] Equity Component [Domain] Cash, cash equivalents, and short-term investments Cash, Cash Equivalents, and Short-term Investments Income Statement Location [Axis] Income Statement Location [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Income Statement Location [Domain] Income Statement Location [Domain] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Property and equipment, net Property, Plant and Equipment, Net Accrued external research and development expenses Accrued External Research And Development Expenses Current Accrued External Research And Development Expenses, Current. Entity Tax Identification Number Entity Tax Identification Number Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Stock-Based Compensation Share-based Payment Arrangement [Text Block] Net loss Net loss and comprehensive loss Net loss Net loss Net Income (Loss) Attributable to Parent Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Other non-current assets Other Assets, Noncurrent Plan Name [Axis] Plan Name [Axis] Cash Equivalents Cash and Cash Equivalents, Fair Value Disclosure Series C Redeemable Convertible Preferred Stock Series C Preferred Stock Series C Redeemable Convertible Preferred Stock [Member] Schedule Of Common Stock Reserved For Future Issuance [Table] Schedule Of Common Stock Reserved For Future Issuance [Table] Schedule Of Common Stock Reserved For Future Issuance Table Share-based Payment Arrangement, Expensed and Capitalized, Amount [Abstract] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Abstract] Total assets Assets Related Party Transactions Related Party Transactions Disclosure [Text Block] Total current assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date Operating expenses: Operating Expenses [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Schedule Of Common Stock Reserved For Future Issuance [Abstract] Schedule Of Common Stock Reserved For Future Issuance [Abstract] Schedule Of Common Stock Reserved For Future Issuance Abstract Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Title of 12(b) Security Title of 12(b) Security Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Schedule of Accrued Liabilities [Table Text Block] Schedule of Accrued Liabilities [Table Text Block] Weighted average grant date fair value of stock options granted, Per share Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Unrealized losses on marketable securities, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Antidilutive Securities [Axis] Antidilutive Securities [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] RogCon Inc. RogCon Inc. [Member] RogCon Inc. Investments, Debt and Equity Securities [Abstract] Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Accretion of redeemable convertible preferred stock to redemption value Temporary Equity, Accretion to Redemption Value Document Fiscal Period Focus Document Fiscal Period Focus Total liabilities Liabilities Two Thousand Twenty Employee Stock Incentive Plan Two Thousand Twenty Employee Stock Incentive Plan [Member] Two Thousand Twenty Employee Stock Incentive Plan Supplemental disclosures of non-cash activities: Supplemental Cash Flow Information [Abstract] Unrecognized compensation expense expected to be recognised Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Weighted average remaining contractual term vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Entity Filer Category Entity Filer Category Summary of stock-based compensation expense Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Common Stock Common Stock [Member] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Convertible Preferred Stocks Convertible Preferred Stocks [Member] Accretion and cumulative dividends on redeemable convertible preferred stock Temporary Equity, Dividends, Adjustment Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Level 1 Fair Value, Inputs, Level 1 [Member] Due to related parties Due to Related Parties Net Loss per Share [Abstract] Net Loss per Share [Abstract] Redeemable convertible preferred stock issuance costs included in accounts payable Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accounts payable Increase (Decrease) in Accounts Payable Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Operating lease liabilities Increase (Decrease) in Operating Lease Liabilities Increase (Decrease) in Operating Lease Liabilities. Property Subject to or Available for Operating Lease [Domain] Property Subject to or Available for Operating Lease [Domain] Additional Paid-In Capital Additional Paid-in Capital [Member] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Money market funds Money Market Funds [Member] Share-based Payment Arrangement Share-based Payment Arrangement [Member] Other Other Operating Activities, Cash Flow Statement Accrued expenses Increase (Decrease) in Accrued Liabilities Aggregate intrinsic value vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Asset Class [Axis] Asset Class [Axis] 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] Issuance of common stock upon exercise of stock options (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Related Party Transactions [Abstract] Related Party Transactions [Abstract] Total other income Nonoperating Income (Expense) Common stock, outstanding (in shares) Beginning balance, Shares Ending balance, shares Common Stock, Shares, Outstanding Share-based Payment Arrangement, Option Employee Stock Option Share-based Payment Arrangement, Option [Member] Available-for-sale, Cost, Maturity of one year or less Debt Securities, Available-for-sale, Amortized Cost, Current Decrease in cash, cash equivalents and restricted cash Cash and Cash Equivalents, Period Increase (Decrease) Loss before benefit from income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Research and development Research and Development Expense Subsequent Events [Abstract] Subsequent Events [Abstract] Cancelled or forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Treasury shares Treasury Stock, Shares Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Shares reserved for future awards under the 2020 Employee Stock Purchase Plan 2020 Employee Stock Purchase Plan [Member] Loss Contingencies [Table] Loss Contingencies [Table] Common stock, authorized (in shares) Common Stock, Shares Authorized Plan Name [Domain] Plan Name [Domain] Proceeds from exercise of options to purchase common stock Proceeds from Stock Options Exercised Available-for-Sale, Cost, Maturity of one to two years Debt Securities, Available-for-sale, Amortized Cost, Noncurrent Additional paid-in capital Additional Paid in Capital Class of Stock [Axis] Class of Stock [Axis] Benefit from income taxes Income Tax Expense (Benefit) Income Statement [Abstract] Income Statement [Abstract] Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Accretion of redeemable convertible preferred stock to redemption value Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock Accrued expenses Total accrued expenses Accrued Liabilities, Current Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Series B Redeemable Convertible Preferred Stock Series B Preferred Stock SeriesBRedeemableConvertiblePreferredStock [Member] Series B Redeemable Convertible Preferred Stock. Local Phone Number Local Phone Number Beginning balance, Shares Ending balance, shares Temporary Equity, Shares Outstanding 2017 Stock Incentive Plan Twenty Seventeen Employee Stock Incentive Plan [Member] Aggregate intrinsic value exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Summary of restricted stock activity Nonvested Restricted Stock Shares Activity [Table Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Current assets: Assets, Current [Abstract] Depreciation expense Depreciation Entity Address, Address Line One Entity Address, Address Line One Investments Investments, Fair Value Disclosure Entity Address, Address Line Two Entity Address, Address Line Two Repurchase of Series C redeemable convertible preferred stock Temporary Equity Value Acquired Temporary equity value acquired Related Party Transaction [Domain] Related Party Transaction [Domain] Entity Emerging Growth Company Entity Emerging Growth Company Issuance of common stock upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Comprehensive Income (Loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Award Type [Axis] Award Type [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment City Area Code City Area Code Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Document Period End Date Document Period End Date Restricted cash Restricted Cash Accumulated Deficit Retained Earnings [Member] Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Common stock reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance 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] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted average remaining contractual term outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Domain] Award Type [Domain] Corporate debt securities Corporate Debt Securities [Member] Trading Symbol Trading Symbol Exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Series C redeemable convertible preferred stock issuance costs Temporary Equity, Issuance Costs Temporary Equity, Issuance Costs Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Net Loss per Share Earnings Per Share [Text Block] Vesting of restricted common stock awards (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Cover [Abstract] Cover [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Debt Securities, Available-for-sale Debt Securities, Available-for-sale [Table Text Block] Current liabilities: Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company Fair Value, Recurring Fair Value, Recurring [Member] Vested and expected to vest (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Unaudited Interim Condensed Consolidated Financial Information Unaudited Interim Condensed Consolidated Financial Information [Policy Text Block] Unaudited interim condensed consolidated financial information Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]