Entity Central Index Key Lessee operating lease liability payments due year five and thereafter. Cover [Abstract] Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, Address Line Two Entity Address Address Line2 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Central Index Key Statement Of Financial Position [Abstract] Assets Assets [Abstract] Current assets Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term investments, available-for-sale Available For Sale Securities Debt Securities Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Restricted cash Restricted Cash Noncurrent Property and equipment, net Property Plant And Equipment Net Operating lease right-of-use assets Operating Lease Right Of Use Asset Other long-term assets Other Assets Noncurrent Total assets Assets Liabilities and stockholders’ equity Liabilities And Stockholders Equity [Abstract] Current liabilities Liabilities Current [Abstract] Accounts payable Accounts Payable Current Operating lease liabilities, current portion Operating Lease Liability Current Accrued and other current liabilities Accrued Liabilities Current Total current liabilities Liabilities Current Operating lease liabilities, net of current portion Operating Lease Liability Noncurrent Other long-term liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 7) Commitments And Contingencies Stockholders’ equity Stockholders Equity [Abstract] Preferred stock Preferred Stock Value Common stock Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Income Statement [Abstract] Operating expenses Operating Expenses [Abstract] Research and development Research And Development Expense General and administrative General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Other income (expense), net: Nonoperating Income Expense [Abstract] Change in fair value of preferred stock purchase right liability Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings Interest income Investment Income Net Other income (expense), net Other Nonoperating Income Expense Total other income (expense), net Nonoperating Income Expense Net loss Net Income Loss Comprehensive loss: Comprehensive Income Net Of Tax [Abstract] Net loss Other comprehensive gain (loss) Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Comprehensive loss Comprehensive Income Net Of Tax Net loss per share, basic and diluted Earnings Per Share Basic And Diluted Weighted average shares used to compute net loss per share, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Stock issued during period value vesting of shares of common stock subject to repurchase. Stock issued during period shares vesting of shares of common stock subject to repurchase. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Convertible Preferred Stock Convertible Preferred Stock [Member] Accumulated Other Comprehensive (Income) Loss Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive (Income) Loss Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Beginning Balance Temporary Equity, Beginning Balance, Shares Temporary Equity Shares Outstanding Temporary Equity, Beginning Balance Temporary Equity Carrying Amount Attributable To Parent Beginning Balance, Shares Shares Outstanding Vesting of shares of common stock subject to repurchase Stock Issued During Period Value Vesting Of Shares Of Common Stock Subject To Repurchase Vesting of shares of common stock subject to repurchase, Shares Stock Issued During Period Shares Vesting Of Shares Of Common Stock Subject To Repurchase Issuance of common stock upon exercise of stock option, net of repurchase Stock Issued During Period Value Stock Options Exercised Issuance of common stock upon exercise of stock option, net of repurchase, Shares Stock Issued During Period Shares Stock Options Exercised Share-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Unrealized gain (loss) on short-term investments Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Ending Balance Temporary Equity, Ending Balance, Shares Temporary Equity, Ending Balance Ending Balance, Shares Increase (Decrease) in accounts payable and accrued and other liabilities. Proceeds from early exercise of stock options. Payments of deferred offering costs. Statement Of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss Adjustments to reconcile net loss to net cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Share-based compensation expense Share Based Compensation Depreciation and amortization Depreciation And Amortization Accretion and amortization of premiums and discounts on investments, net Accretion Amortization Of Discounts And Premiums Investments Non-cash lease expense Operating Lease Right Of Use Asset Amortization Expense Change in fair value of preferred stock purchase right liability Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Prepaid expenses and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable and accrued and other liabilities Increase Decrease In Accounts Payable And Accrued And Other Liabilities Net cash used in operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities Net Cash Provided By Used In Investing Activities [Abstract] Purchases of property and equipment Payments To Acquire Property Plant And Equipment Purchases of short-term investments Payments To Acquire Short Term Investments Maturities of short-term investments Proceeds From Sale Of Short Term Investments Net cash provided by (used in) investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from stock option exercises Proceeds From Stock Options Exercised Proceeds from early exercise of stock options Proceeds From Early Exercise Of Stock Options Liability to related party Proceeds From Related Party Debt Payments of deferred offering costs Payments Of Deferred Offering Costs Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net decrease in cash and cash equivalents Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash, cash equivalents, and restricted cash beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Cash, cash equivalents, and restricted cash end of period Reconciliation of cash, cash equivalents and restricted cash to the balance sheet: Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract] Restricted cash Restricted Cash Total cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization and Description of Business Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Basis of Presentation and Significant Accounting Policies Significant Accounting Policies [Text Block] Earnings Per Share [Abstract] Net Loss Per Share Earnings Per Share [Text Block] Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Balance Sheet Related Disclosures [Abstract] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Leases [Abstract] Leases Lessee Operating Leases [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Collaboration agreement. Collaboration Agreement [Abstract] CRISPR Collaboration Agreement Collaborative Arrangement Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Share-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Unusual or infrequent items disclosure. COVID-19 Pandemic Unusual Or Infrequent Items Disclosure Policy [Text Block] Use of Estimates Use Of Estimates Net Loss Per Share Earnings Per Share Policy [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Computation of Basic and Diluted Net Loss Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Summarizes the Outstanding Potentially Dilutive Securities Excluded in Calculation of Diluted Net Loss Per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Short-term investments Short Term Investments [Member] Summary of Fair Value of Financial Instrument Fair Value By Balance Sheet Grouping [Text Block] Schedule of Short-term Investments Debt Securities Available For Sale Table [Text Block] Schedule of prepaid expenses and other current assets. Schedule of Prepaid Expenses and Other Current Assets Schedule Of Prepaid Expenses And Other Current Assets Table [Text Block] Schedule of Property and Equipment, Net Property Plant And Equipment [Text Block] Schedule of Accrued Other Current Liabilities Schedule Of Accounts Payable And Accrued Liabilities Table [Text Block] Schedule of Maturities of Operating Lease Liabilities Lessee Operating Lease Liability Maturity Table [Text Block] Summary of Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Share-based Compensation Expense Schedule Of Compensation Cost For Share Based Payment Arrangements Allocation Of Share Based Compensation Costs By Plan Table [Text Block] Number of operating segments Number Of Operating Segments Cash cash equivalents restricted cash and short term investments. Accumulated deficit Cash, cash equivalents restricted cash and short-term investments Cash Cash Equivalents Restricted Cash And Short Term Investments Accounting policies. Accounting policies. Accounting Policies [Table] Accounting Policies [Table] Accounting Standards Update Adjustments For New Accounting Pronouncements [Axis] Accounting Standards Update Type Of Adoption [Member] ASU 2019-12 Adjustments For New Accounting Principle Early Adoption [Member] Accounting Policies [Line Items] Accounting Policies [Line Items] Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Change In Accounting Principle Accounting Standards Update Adopted Change in Accounting Principle, Accounting Standards Update, Adoption Date Change In Accounting Principle Accounting Standards Update Adoption Date Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Change In Accounting Principle Accounting Standards Update Immaterial Effect Weighted average number of shares unvested common stock issued upon early exercise of common stock options. Numerator: Net Income Loss [Abstract] Denominator: Weighted Average Number Of Shares Outstanding [Abstract] Weighted average common shares outstanding Weighted Average Number Of Shares Issued Basic Less: weighted average unvested common stock issued upon early exercise of common stock options Weighted Average Number Of Shares Unvested Common Stock Issued Upon Early Exercise Of Common Stock Options Weighted average shares used to compute net loss per share, basic and diluted Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Common stock options. Common Stock Options Common Stock Options [Member] Unvested common stock upon early exercise of common stock options. Unvested Common Stock Upon Early Exercise of Common Stock Options Unvested Common Stock Upon Early Exercise Of Common Stock Options [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value Inputs Level1 [Member] Significant Other Observable Inputs (Level 2) Fair Value Inputs Level2 [Member] Significant Unobservable Inputs (Level 3) Fair Value Inputs Level3 [Member] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Corporate Debt Securities Corporate Debt Securities [Member] U.S. Government Securities U S Government Agencies Debt Securities [Member] Cash and Cash Equivalents Cash And Cash Equivalents [Axis] Cash and Cash Equivalents Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Commercial Paper Commercial Paper [Member] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Assets: Assets Fair Value Disclosure [Abstract] Money market funds Money Market Funds At Carrying Value Total short-term investments Short Term Investments Total Assets Fair Value Disclosure Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Money Market Funds Money Market Funds [Member] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Investments Cash And Cash Equivalents Fair Value Disclosure Marketable securities Marketable Securities Current Accrued interest receivable Interest Receivable Current U.S. Government Securities U S Government Corporations And Agencies Securities [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Maximum Maximum [Member] Minimum [Member] Minimum [Member] Available for sale securities, Amortized Cost Available For Sale Debt Securities Amortized Cost Basis Available for sale securities, Unrealized Losses Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Available for sale securities, Unrealized Gains Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Available for sale securities,Estimated Fair Value Available For Sale Securities Debt Securities Available-for-sale securities, Maturity (in years) Debt Securities Available For Sale Term Impairments. Impairments Impairments Realized gain or loss on available-for-sale securities Debt Securities Available For Sale Realized Gain Loss Prepaid expenses Prepaid Expense Current Other current assets Other Assets Current Total prepaid expenses and other current assets Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Leasehold Improvements Leasehold Improvements [Member] Furniture and Fixtures Furniture And Fixtures [Member] Research equipment. Research Equipment Research Equipment [Member] Computers and software. Computers and Software Computers And Software [Member] Construction in Progress Construction In Progress [Member] Property Plant And Equipment [Line Items] Property Plant And Equipment [Line Items] Total property and equipment Property Plant And Equipment Gross Less accumulated depreciation and amortization Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Total property and equipment, net Depreciation and amortization expense Depreciation Depletion And Amortization Accrued research and development costs current. Accrued property and equipment liabilities current. Accrued compensation Employee Related Liabilities Current Accrued research and development costs Accrued Research And Development Costs Current Accrued property and equipment Accrued Property And Equipment Liabilities Current Other accrued and current liabilities Accounts Payable And Other Accrued Liabilities Current Total accrued and other liabilities Accounts Payable And Accrued Liabilities Current Lessee Lease Description [Table] Lessee Lease Description [Table] Corporate office and laboratory space. Corporate Office and Laboratory Space Corporate Office And Laboratory Space [Member] Corporate office and laboratory facilities. Corporate Office and Laboratory Facilities Corporate Office And Laboratory Facilities [Member] Lease Contractual Term Lease Contractual Term [Axis] Lease Contractual Term Lease Contractual Term [Domain] Third amendment. Third amendment Third Amendment [Member] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Rent expense Operating Lease Expense Weighted-average remaining lease term Operating Lease Weighted Average Remaining Lease Term1 Cash paid for operating leases Operating Lease Payments Weighted-average discount rate Operating Lease Weighted Average Discount Rate Percent Lease expiration year. Lease term Lessee Operating Lease Remaining Lease Term Lease expiration year Lease Expiration Year Renewal term Lessee Operating Lease Renewal Term Operating lease, existence of option to extend Lessee Operating Lease Existence Of Option To Extend Lessee option to extend description Lessee Operating Lease Option To Extend Lease expiration month and year. Lease expiration month and year Lease Expiration Month And Year 2021 (remaining six months) Lessee Operating Lease Liability Payments Remainder Of Fiscal Year 2022 Lessee Operating Lease Liability Payments Due Next Twelve Months 2023 Lessee Operating Lease Liability Payments Due Year Two 2024 Lessee Operating Lease Liability Payments Due Year Three 2025 Lessee Operating Lease Liability Payments Due Year Four 2026 and thereafter Lessee Operating Lease Liability Payments Due Year Five And Thereafter Total future minimum lease payments Lessee Operating Lease Liability Payments Due Less imputed interest Lessee Operating Lease Liability Undiscounted Excess Amount Present value of net minimum lease payments Operating Lease Liability Operating lease liabilities: Operating Lease Liability [Abstract] Total lease liability Loss Contingencies [Table] Loss Contingencies [Table] Collaborative Arrangement and Arrangement Other than Collaborative Type Of Arrangement [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Arrangements And Nonarrangement Transactions [Member] Agreement with financial institution. Agreement with Financial Institution Agreement With Financial Institution [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Liabilities recorded for agreements Guarantee Obligations Current Carrying Value Letter of credit notice period by financial institution before annual expiration date. Letters of credit outstanding amount Letters Of Credit Outstanding Amount Letter of credit notice period by financial institution before annual expiration date Letter Of Credit Notice Period By Financial Institution Before Annual Expiration Date Number of non-exclusive rights to gene editing targets. Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Research collaboration agreement. Research Collaboration Agreement Research Collaboration Agreement [Member] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] NK cell products. NK Cell Products N K Cell Products [Member] Research and Development Arrangement, Contract to Perform for Others, Type Research And Development Arrangement Contract To Perform For Others By Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type Research And Development Arrangement Contract To Perform For Others Type [Domain] Development and regulatory approval milestones. Development and Regulatory Approval Milestones Development And Regulatory Approval Milestones [Member] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Number of non-exclusive rights to gene editing targets Number Of Non Exclusive Rights To Gene Editing Targets Potential future payments based on achievement of milestones. Amounts owed under the agreement. Payments made under collaborative arrangement. Potential future payments Potential Future Payments Based On Achievement Of Milestones Amount paid under the agreement Payments Made Under Collaborative Arrangement Amounts owed under the agreement. Amounts Owed Under Agreement Increase in share limit as percentage of outstanding shares of common stock on last trading day in prior year. Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Two thousand twenty performance incentive plan. 2020 Plan Two Thousand Twenty Performance Incentive Plan [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] 2020 Employee Stock Purchase Plan Employee Stock [Member] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Restricted Stock Restricted Stock [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Number of common stock authorized for issuance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Increase in share limit as percentage of outstanding shares of common stock on last trading day in prior year Increase In Share Limit As Percentage Of Outstanding Shares Of Common Stock On Last Trading Day In Prior Year Number of shares, outstanding beginning balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Number of shares, granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Number of shares, exercised Number of shares, forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Number of shares, outstanding ending balance Number of shares, exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Number of shares, vested and expected to vest Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number Weighted-average exercise price, outstanding beginning balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted-average exercise price, granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted-average exercise price, exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted-average exercise price, forfeited Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Weighted-average exercise price, outstanding ending balance Weighted-average exercise price, exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted-average exercise price, vested and expected to vest Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price Weighted-average remaining contractual term (in years), outstanding balance Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted-average remaining contractual term (in years), exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Weighted-average remaining contractual term (in years), vested and expected to vest Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 Weighted average grant date fair value of stock option Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award offering period. Number of common stock available for issuance Common Stock Capital Shares Reserved For Future Issuance Maximum percentage of employee compensation eligible for plan Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate Offering period Share Based Compensation Arrangement By Share Based Payment Award Offering Period Commons stock purchase price as percentage of fair value Sharebased Compensation Arrangement By Sharebased Payment Award Purchase Price Of Common Stock Percent Shares issued Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period Shares subject to repurchase Stock Repurchase Program Number Of Shares Authorized To Be Repurchased Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Research and Development Research And Development Expense [Member] General and Administrative General And Administrative Expense [Member] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share-based compensation expense Allocated Share Based Compensation Expense Unrecognized compensation cost Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Unrecognized compensation cost, expected to be recognized over weighted average remaining service period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Provision for income taxes Income Tax Expense Benefit Monthly base rent. Maximum monthly base rent after increase on annual basis. Expected base rent over the lease term. Tenant improvements yet to receive from lessor. Cash received for tenant improvement allowances to be repaid. Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Short-term Debt, Type Short Term Debt Type [Axis] Short-term Debt, Type Short Term Debt Type [Domain] Letter of Credit Letter Of Credit [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Lessee, operating lease, term of contract Lessee Operating Lease Term Of Contract Monthly base rent Monthly Base Rent Maximum monthly base rent after increase on annual basis Maximum Monthly Base Rent After Increase On Annual Basis Expects to pay base rent over the lease term. Expected Base Rent Over Lease Term Tenant improvement allowances yet to receive Tenant Improvements Yet To Receive From Lessor Cash received for tenant improvement allowances to be repaid Cash Received For Tenant Improvement Allowances To Be Repaid Security deposit Security Deposit