Cover Abstract Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Title of 12(b) Security Trading Symbol Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Public Float Document Fiscal Year Focus Document Fiscal Period Focus Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Common Stock, Shares Outstanding BALANCE SHEETS Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Series A Preferred Stock [Member] Series A Preferred Stock Series B Preferred Stock [Member] Series B Preferred Stock Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents Debt Securities, Available-for-sale, Current Marketable securities Restricted Cash, Current Restricted cash Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and Stockholders’ Equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued liabilities Total accrued liabilities Deferred Rent Credit, Current Deferred rent, current portion Long-term Debt, Current Maturities Less: current portion of term loan Term loan, current portion Amount of deferred income from related party transactions excluding obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current. Related Party Transactions, Deferred Revenue, Current Deferred revenue, current portion Liabilities, Current Total current liabilities Deferred Rent Credit, Noncurrent Deferred rent, net of current portion Long-term Debt, Excluding Current Maturities Term loan, net of current portion Amount of deferred income from related party transactions excluding obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent. Related Party Transactions, Deferred Revenue, Noncurrent Deferred revenue, net of current portion Liabilities Total liabilities Not available. Preferred Stock Abstract Redeemable preferred stock: Preferred Stock Temporary Equity, Carrying Amount, Attributable to Parent Balance at the end Balance at the beginning Total redeemable preferred stock Stockholders' Equity Attributable to Parent [Abstract] Stockholders’ equity Preferred Stock, Value, Issued Preferred stock; par value of $0.001 per share; 10,000,000 shares authorized at December 31, 2020 and 2019. No shares issued and outstanding at December31, 2020 and 2019 Common Stock, Value, Issued Common stock, par value of $0.001 per share; 100,000,000 shares authorized at December 31, 2020 and 2019, respectively, 27,568,802 and 27,499,260 shares issued and outstanding at December 31, 2020 and 2019, respectively Additional Paid in Capital Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Balance at the end Balance at the beginning Total stockholders’ equity Liabilities and Equity Total liabilities and stockholders’ equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value per share Preferred Stock, Shares Authorized Preferred stock, number of shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value per share Common Stock, Shares Authorized Common stock, number of shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Balance at the end (in shares) Balance at the beginning (in shares) Common stock, shares outstanding STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Revenue from Contract with Customer [Abstract] Revenue: Revenue from Contract with Customer, Excluding Assessed Tax Revenue 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 Other Nonoperating Income (Expense) Other income, net Net Income (Loss) Attributable to Parent Net loss Net loss Earnings Per Share, Basic and Diluted [Abstract] Loss per share Earnings Per Share, Basic and Diluted Net loss per common share—basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Shares used in the calculation of loss per share Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average number of common shares —basic and diluted (in shares) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Comprehensive loss: Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Unrealized gain (loss) on marketable securities Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive loss STATEMENTS OF PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Stock [Member] Preferred Stock Common Stock [Member] Common Stock Additional Paid In Capital [Member] Additional Paid-in Capital Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) Retained Earnings [Member] Accumulated Deficit Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Deficit Temporary Equity, Shares Outstanding Balance at the end (in shares) Balance at the beginning (in shares) Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock based compensation Stock Issued During Period, Value, New Issues Issuance of common stock Stock Issued During Period, Shares, New Issues Issuance of common stock (in shares) Equity impact of the value of new stock issued during the period. Stock Issued During Period Value Initial Public Offering Public offerings of common stock, net of issuance costs of $20.7 million Number of new stock issued during the period from initial public offering. Stock Issued During Period Shares Initial Public Offering Public offerings of common stock, net of issuance costs of $20.7 million (in shares) Stock Issued During Period, Value, Conversion of Units Conversion of preferred stock to common stock Stock Issued During Period, Shares, Conversion of Units Conversion of preferred stock to common stock (in shares) Adjusted amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Adjusted Unrealized (loss) gain on marketable securities Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Initial public offering issuance costs STATEMENTS OF CASH FLOWS 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 Depreciation and amortization Share-based Compensation Stock-based compensation Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued liabilities Amount of increase (decrease) of consideration of unpaid rent that provides economic benefits in future periods. Increase Decrease In Deferred Rent Deferred rent Amount of increase (decrease) in deferred income from related party and obligation to transfer product and service to customer for which consideration has been received or is receivable. Increase (Decrease) in Deferred Revenue From Related Party 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: Proceeds from Sale and Maturity of Marketable Securities Maturities of marketable securities Payments to Acquire Marketable Securities Purchase of marketable securities Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Issuance Initial Public Offering Proceeds from issuance of shares, net Proceeds from public offering of common stock, net of issuance costs Proceeds from Issuance of Common Stock Proceeds from issuances of common stock Proceeds from Issuance of Debt Proceeds from the term loan Repayments of Debt Payments of the term loan Net Cash Provided by (Used in) Financing Activities Net cash (used in) provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash—end of period Cash, cash equivalents and restricted cash—beginning of period Total Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for interest Noncash Investing and Financing Items [Abstract] Supplemental disclosures of noncash investing and financing activities: Capital Expenditures Incurred but Not yet Paid Purchase of property and equipment included in accrued liabilities Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Deferred financing costs included in accrued liabilities Represents the noncash conversion of convertible preferred stock into common stock. Noncash Or Part Noncash Conversion of Convertible Preferred Stock Into Common Stock Conversion of convertible preferred stock into common stock Nature of the Business and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Nature of the Business and Basis of Presentation Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Marketable Securities Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Property and Equipment, Net Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Liabilities N/A Former Agreement with Eli Lilly and Company Collaborative Arrangement Disclosure [Text Block] Former Agreement with Eli Lilly and Company Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Term Loan Debt Disclosure [Text Block] Term Loan Preferred Stock. Preferred Stock [Text Block] Preferred Stock Common Stock. The entire disclosure for terms, amounts, nature of changes, rights and privileges, dividends, and other matters related to common stock. Common Stock [Text Block] Common Stock Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Net Loss Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Net Loss Per Share Attributable to Common Stockholders Income Taxes Income Tax Disclosure [Text Block] Income Taxes Employee Benefit Plan Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plan Subsequent Events Subsequent Events [Text Block] Subsequent Events Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Use of Estimates, Policy [Policy Text Block] Use of Estimates Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Marketable Securities, Policy [Policy Text Block] Marketable Securities Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment, Net Separation of Lease and Nonlease Components [Policy Text Block] Leases Stockholders' Equity Note, Redeemable Preferred Stock, Issue, Policy [Policy Text Block] Preferred Stock Research and Development Expense, Policy [Policy Text Block] Research and Development Costs, Including Clinical Trial Accruals Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Patent Costs Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Stock Based Compensation Income Tax, Policy [Policy Text Block] Income Taxes Revenue from Contract with Customer [Policy Text Block] Revenue Recognition Comprehensive Income, Policy [Policy Text Block] Comprehensive Loss Earnings Per Share, Policy [Policy Text Block] Net Loss per Share New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Pronouncements Cash, Cash Equivalents and Investments [Table Text Block] Summary of reconciliation cash and cash equivalents and restricted cash per the balance sheet to the statement of cash flows Represents the tabular disclosure of estimated useful lives for property and equipment. Property, Plant and Equipment, Estimated Useful Lives [Table Text Block] Summary of estimated useful lives for property and equipment Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of marketable securities Tabular disclosure of the maturities of available-for-sale securities from cost basis to fair value. Schedule Of Available For Sale Securities Maturities Table Text Block Schedule of available-for-sale maturities Fair Value, by Balance Sheet Grouping [Table Text Block] Summary of fair value of the Company’s financial assets Property, Plant and Equipment [Table Text Block] Summary of property and equipment Schedule of Accrued Liabilities [Table Text Block] Summary of accrued liabilities Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of future minimum payments Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of future maturities Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of stock option activity Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Summary of stock based compensation expense recorded Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of assumptions used in the Black Scholes option pricing model for stock options granted Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Summary of shares excluded from the computation of diluted net loss per share Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Summary of reconciliation of federal statutory income tax rate to the Company’s effective income tax rate Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary of components of deferred tax assets Subsequent Event [Table] Sale of Stock [Axis] Sale Of Stock Name Of Transaction [Domain] Sale of Stock [Domain] I P O [Member] IPO Subsequent Event [Line Items] Nature of the Business Stockholders' Equity Note, Stock Split, Conversion Ratio Reverse stock split ratio Share Price Share price Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from issuance of preferred stock, net of issuance costs The cash outflow for payment of underwriting discounts and commissions. Payments Of Underwriting Discounts And Commissions Underwriting discounts and commissions Payments of Stock Issuance Costs Offering expenses Schedule of Stock by Class [Table] Class of Stock [Line Items] Preferred stock Number of Operating Segments Number of operating segment Restricted Cash Amount of required reserve of restricted cash. Required Reserve Restricted Cash Current Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Represents restricted cash and other assets current. Restricted Cash And Other Assets Current Restricted cash (including $1,806 and $3,333 in other assets as of December 31, 2020 and 2019, respectively) Represents other assets non-current from restricted cash. Restricted Cash Other Assets Non Current Other assets, restricted cash Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property Plant And Equipment Type [Domain] Property, Plant and Equipment, Type [Domain] Computer Equipment [Member] Computer equipment Equipment [Member] Equipment Furniture And Fixtures [Member] Furniture and fixtures Property, Plant and Equipment [Line Items] Property, plant and equipment Property, Plant and Equipment, Estimated Useful Lives Impairment of Long Lived Assets Impairment of Long-Lived Assets to be Disposed of Impairment loss recognized Income Tax Uncertainties [Abstract] Income Taxes Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Uncertain income tax benefits, interest or penalties Debt Securities, Available-for-sale [Table] Financial Instrument [Axis] Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Financial Instruments [Domain] U S Treasury Securities [Member] U.S. treasury securities U S Government Agencies Debt Securities [Member] Agency bonds Corporate Debt Securities [Member] Corporate bonds Debt Securities, Available-for-sale [Line Items] Investments Debt Securities, Available-for-sale, Amortized Cost Amortized Cost Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Loss Debt Securities, Available-for-sale Marketable securities Estimated Fair Value Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss Marketable securities other-than-temporarily impaired Available-for-sale Securities, Gross Realized Gains Gross realized gains Available-for-sale Securities, Debt Maturities [Abstract] Cost Maturities: Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Within 1 year Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year to year two. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Available For Sale Securities Debt Maturities After One Through Two Years Amortized Cost Between 1 to 2 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Total investments available for sale Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Fair Value Maturities: Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Within 1 year Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in through second 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). Available For Sale Securities Debt Maturities After One Through Two Years Fair Value Between 1 to 2 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Total investments available for sale Fair Value, by Balance Sheet Grouping [Table] Cash and Cash Equivalents [Axis] Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Cash and Cash Equivalents [Domain] Money Market Funds [Member] Money market funds (cash equivalents) Measurement Basis [Axis] Portion At Fair Value Fair Value Disclosure [Member] Portion at Fair Value Measurement [Member] Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value Fair Value Hierarchy and NAV [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Inputs Level1 [Member] Quoted Prices in Active Markets (Level 1) Fair Value Inputs Level2 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Fair value of the Company’s financial assets Cash and Cash Equivalents, Fair Value Disclosure Money market funds (cash equivalents) 1 Marketable Securities And Cash Equivalents Total financial assets Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Assets transferred from level 1 to level 2 Fair Value, Assets, Level 2 to Level 1 Transfers, Amount Assets transferred from level 2 to level 1 Tangible research equipment. Research Equipment [Member] Research equipment Leasehold Improvements [Member] Leasehold improvements Construction In Progress [Member] Construction in progress Property, Plant and Equipment, Net [Abstract] Property and Equipment, Net Property, Plant and Equipment, Gross Property and equipment, gross Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: accumulated depreciation and amortization Carrying value as of the balance sheet date of obligations incurred through that date and payable for construction in progress. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued Construction In Progress, Current Construction in progress Employee-related Liabilities, Current Payroll and related benefits Carrying value as of the balance sheet date of obligations incurred through that date and payable for clinical trial costs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued Clinical Trial Costs, Current Clinical trial costs Carrying value as of the balance sheet date of obligations incurred through that date and payable for operating expenses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued Operating Expenses, Current Operating expenses Other Liabilities, Current Other Collaborative Arrangement and Arrangement Other than Collaborative [Table] Type of Arrangement and Non-arrangement Transactions [Axis] Arrangements And Nonarrangement Transactions [Member] Arrangements and Non-arrangement Transactions [Domain] Represents information pertaining to research and development collaboration agreement. Research And Development Collaborative Agreement [Member] Lilly Agreement Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Collaborative Arrangements Operating Leases, Rent Expense, Net Rent expenses operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Future minimum payments: Operating Leases, Future Minimum Payments Due, Next Twelve Months 2021 Operating Leases, Future Minimum Payments, Due in Two Years 2022 Operating Leases, Future Minimum Payments, Due in Three Years 2023 Operating Leases, Future Minimum Payments, Due in Four Years 2024 Operating Leases, Future Minimum Payments, Due Thereafter Thereafter Operating Leases, Future Minimum Payments Due Total future minimum payments Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Prime Rate [Member] Prime rate Range [Axis] Range [Member] Range [Domain] Maximum [Member] Maximum Debt Instrument, Face Amount Face amount Debt Instrument, Basis Spread on Variable Rate Spread (as a percent) Debt Instrument, Interest Rate During Period Interest rate (as a percent) Number of periodic payments of principal plus accrued interest (monthly, quarterly, annual). Debt Instrument, Monthly Payments, Number Number of equal monthly payments of principal plus accrued interest Interest Expense Interest expense Long-term Debt Outstanding balance Total Long-term Debt, Fiscal Year Maturity [Abstract] Future maturities: Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two 2022 Long-term Debt, Maturities, Repayments of Principal in Year Three 2023 Represents the number of votes per share. Number Of Votes Per Share Number of votes per share Common Stock, Dividends, Per Share, Declared Dividends declared Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Represents information pertaining to 2015 omnibus incentive plan. A2015 Omnibus Incentive Plan [Member] 2015 Plan Represents information pertaining to Omnibus Incentive 2019 Plan. Omnibus Incentive2019 Plan [Member] Omnibus Incentive Plan Represents information pertaining to 2015 omnibus incentive plan and the information pertaining to 2019 Employee Stock Purchase Plan. Omnibus Incentive2015 Plan And Employee Stock Purchase2019 Plan [Member] 2015 Plan and 2019 Employee Stock Purchase Plan Represents information pertaining to 2019 Employee Stock Purchase Plan. Employee Stock Purchase2019 Plan [Member] 2019 Employee Stock Purchase Plan Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Restricted Common Stock Stock Based Compensation Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Number of shares issued Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting period Period which an employee's right to exercise an award is no longer available. Share Based Compensation Arrangement By Share Based Payment Award Award Expiration Period Expiration period Common Stock, Capital Shares Reserved for Future Issuance Number of shares reserved for issuance under the plan The increase in shares available for issuance as a percentage of number of shares of the company's common stock outstanding on December 31st of the preceding calendar year. Share Based Compensation Arrangement, Increase In Shares For Issuance As A Percentage Of Number Of Common Stock Outstanding Annual increase in number of share reserved for issuance (as percent) The threshold number of shares of the company's common stock available for issuance under the plan. Share Based Compensation Arrangement, Threshold Number Of Common Stock For Issuance Under The Plan Maximum annual increase in shares available for issuance under the plan Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding at the end (in shares) Outstanding at the beginning (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Forfeitures (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Vested and expected to vest at the end (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Exercisable at the end (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding at the end (in dollars per share) Outstanding at the beginning (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested and expected to vest at the end (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Exercisable at the end (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted Average Remaining Contractual Life (Years) And Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Outstanding (in years) Weighted average remaining contractual term for vested portions of options granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants In Period, Weighted Average Remaining Contractual Term Granted (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest at the end (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Exercisable at the end (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Outstanding at the end (in dollars) Outstanding at the beginning (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Vested and expected to vest at the end (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Exercisable at the end (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value per share of stock options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Aggregate grant date fair value Share-based Payment Arrangement, Additional Disclosure [Abstract] Share Based Compensation Expense Not Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Compensation expense recognition period Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Research And Development Expense [Member] Research and development General And Administrative Expense [Member] General and administrative Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock based compensation expense Allocated Share-based Compensation Expense Total stock-based compensation expense Minimum [Member] Minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Fair value assumptions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Risk free interest rate Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities Name [Domain] Antidilutive Securities, Name [Domain] Employee Stock Option [Member] Option to purchase common stock Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive securities excluded from computation of diluted net loss per share Reconciliation of federal statutory income tax rate to the Company’s effective income tax rate Reconciliation of federal statutory income tax rate to the Company’s effective income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Expected income tax benefit at the federal statutory rate (as a percent) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent State taxes, net of federal benefit (as a percent) Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Research and development credit, net (as a percent) Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Non-deductible items (as a percent) Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent Prior year provision to return adjustments (as a percent) Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Change in valuation allowance (as a percent) Effective Income Tax Rate Reconciliation, Percent Total (as a percent) Components of Deferred Tax Assets and Liabilities [Abstract] Principal components of the Company’s deferred tax assets Deferred Tax Assets, Net [Abstract] Deferred tax assets: Deferred Tax Assets, Operating Loss Carryforwards Federal and state net operating loss carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Research Research and development tax credits Deferred Tax Assets, Deferred Income Deferred revenue Deferred Tax Assets, Charitable Contribution Carryforwards Charitable contribution carryforwards Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals and amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other. Deferred Tax Assets Tax Deferred Expense Reserves And Accruals And Other Accruals and other Deferred Tax Assets, Gross Gross deferred tax assets Deferred Tax Assets, Valuation Allowance Less: valuation allowance Deferred Tax Assets, Net of Valuation Allowance Total deferred tax assets Deferred Tax Liabilities, Net [Abstract] Deferred tax liabilities: Amount of deferred tax consequences attributable to taxable temporary differences derived from depreciation and amortization. Deferred Tax Liabilities, Depreciation and Amortization Depreciation and amortization Deferred Tax Liabilities, Unrealized Gains on Trading Securities Unrealized gains Deferred Tax Liabilities, Gross Gross deferred tax liabilities Deferred Tax Assets, Net Net deferred tax assets Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Increase in valuation allowance Deferred Tax Assets, Operating Loss Carryforwards, Domestic Federal net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, State and Local State net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration Federal net operating loss carryforwards that do not expire Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic research and development tax credit carryforwards. Deferred Tax Assets, Tax Credit Carryforwards, Research And Development, Federal Federal research and development tax credit carryforwards Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state research and development tax credit carryforwards. Deferred Tax Assets, Tax Credit Carryforwards, Research And Development, State State research and development tax credit carryforwards Unrecognized Tax Benefits Unrecognized income tax benefits Defined Contribution Plan, Employer Discretionary Contribution Amount Employer contributions amount Commercial Paper Not Included With Cash And Cash Equivalents [Member] Commercial Paper