Entity Central Index Key Cover [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Shell Company Entity Shell Company Entity File Number Entity File Number 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 Entity Incorporation, State or Country Code Entity Incorporation State Country Code Title of 12(b) Security Security12b Title Security Exchange Name Security Exchange Name Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Marketable securities Marketable Securities Current Accounts receivable Accounts Receivable Net Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Marketable securities - noncurrent Marketable Securities Noncurrent Property and equipment, net Property Plant And Equipment Net Operating lease right-of-use assets Operating Lease Right Of Use Asset Other 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 Accrued expenses Accrued Liabilities Current Current portion of operating lease liability Operating Lease Liability Current Current portion of deferred revenue Contract With Customer Liability Current Total current liabilities Liabilities Current Deferred revenue, net of current portion Contract With Customer Liability Noncurrent Long-term operating lease liability Operating Lease Liability Noncurrent Commitments and contingencies (Note 6) Commitments And Contingencies Stockholders’ Equity: Stockholders Equity [Abstract] Common stock, $0.0001 par value; 120,000,000 shares authorized; 68,331,780 and 66,234,056 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive (loss) 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 Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Collaboration revenue Revenue From Contract With Customer Excluding Assessed Tax Type of Revenue [Extensible List] Type Of Revenue Extensible List Operating expenses: Costs And Expenses [Abstract] Research and development Research And Development Expense General and administrative General And Administrative Expense Total operating expenses Costs And Expenses Operating loss Operating Income Loss Interest income Investment Income Interest Net loss Net Income Loss Net loss per share, basic and diluted Earnings Per Share Basic And Diluted Weighted average shares outstanding, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Other comprehensive loss: Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest [Abstract] Unrealized loss on marketable securities Marketable Securities Unrealized Gain Loss Comprehensive loss Comprehensive Income Net Of Tax Increase (decrease) in operating right of use assets. Increase (decrease) in operating lease liabilities. Right-of-use assets acquired under operating lease. Statement Of Cash Flows [Abstract] Statement [Table] Statement [Table] Counterparty Name Counterparty Name [Axis] Counterparty Name Repurchase Agreement Counterparty Name [Domain] Regeneron Pharmaceuticals Inc. Regeneron Pharmaceuticals Inc. [Member] Regeneron Pharmaceuticals Inc [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Follow-on public offering. Follow-on Offering [Member] Follow On Public Offering [Member] At-the-market offerings. At The Market Offerings [Member] At The Market Offerings [Member] Statement [Line Items] Statement [Line Items] 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) provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Equity-based compensation Share Based Compensation Amortization/(accretion) of investment premiums/(discounts) Accretion Amortization Of Discounts And Premiums Investments Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Operating right-of-use assets Increase Decrease In Operating Right Of Use Assets Other assets Increase Decrease In Other Operating Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses Increase Decrease In Accrued Liabilities Deferred revenue Increase Decrease In Contract With Customer Liability Operating lease liabilities Increase Decrease In Operating Lease Liabilities Net cash (used in) provided by 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 marketable securities Payments To Acquire Marketable Securities Maturities of marketable securities Proceeds From Sale And Maturity Of Marketable Securities Net cash provided by 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 issuance of common stock Proceeds From Issuance Of Common Stock Proceeds from options exercised Proceeds From Stock Options Exercised Issuance of shares through employee stock purchase plan Proceeds From Stock Plans Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net (decrease) increase in cash and cash equivalents and restricted cash and cash equivalents Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash and cash equivalents and restricted cash and cash equivalents, beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Cash and cash equivalents and restricted cash and cash equivalents, end of period Reconciliation of cash and cash equivalents and restricted cash and cash equivalents to condensed consolidated balance sheet: Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract] Restricted cash and cash equivalents, included in prepaids and other current assets and other assets Restricted Cash Equivalents SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Purchases of property and equipment unpaid at period end Capital Expenditures Incurred But Not Yet Paid Right-of-use assets acquired under operating leases Right Of Use Assets Acquired Under Operating Lease Offering costs unpaid at period end Proceeds From Issuance Initial Public Offering Organization Consolidation And Presentation Of Financial Statements [Abstract] Overview and Basis of Presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Investments Debt And Equity Securities [Abstract] Marketable Securities Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Payables And Accruals [Abstract] Accrued Expenses Accounts Payable And Accrued Liabilities Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Collaborations Collaborative Arrangement Disclosure [Text Block] Leases [Abstract] Leases Lessee Operating Leases [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Equity-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Earnings Per Share [Abstract] Loss Per Share Earnings Per Share [Text Block] Equity [Abstract] Stockholders’ Equity Stockholders Equity Note Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Recent Accounting Pronouncements - Adopted New Accounting Pronouncements Policy Policy [Text Block] Summary of Available-for-sale Marketable Securities Marketable Securities [Text Block] Summary of Financial Assets Recognized at Fair Value on Recurring Basis Fair Value Assets Measured On Recurring Basis [Text Block] Schedule of Accrued Expenses Schedule Of Accrued Liabilities Table [Text Block] Changes in accounts receivable and contract liabilities. Summary of Changes in Accounts Receivable and Contract Liabilities Changes In Accounts Receivable And Contract Liabilities Table [Text Block] Revenue from contract with customer. Summary of Revenues Recognized Resulting From Changes in Contract Liability Balance Revenue From Contract With Customer Table [Text Block] Schedule of Equity-Based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Summary of Restricted Stock Activity Schedule Of Share Based Compensation Restricted Stock Units Award Activity Table [Text Block] Summary of Weighted Average Assumptions Used to Compute Fair Value of Option Granted Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Schedule of Basic and Diluted Net Loss Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Potential Dilutive Securities Excluded from Computation of Diluted Net Loss Per Common Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Schedule of Changes in Stockholders’ Equity Schedule Of Stockholders Equity Table [Text Block] Organization consolidation and presentation of financial statements disclosure. Organization Consolidation And Presentation Of Financial Statements Disclosure [Table] Organization Consolidation And Presentation Of Financial Statements Disclosure [Table] Organization Consolidation And Presentation Of Financial Statements Disclosure [Table] Initial public offering and concurrent private placements. Initial Public Offering and Concurrent Private Placements [Member] Initial Public Offering And Concurrent Private Placements [Member] Follow-on public Offerings [Member] Collaborative Arrangement and Arrangement Other than Collaborative Type Of Arrangement [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Arrangements And Nonarrangement Transactions [Member] Collaborative Arrangement [Member] Collaborative Arrangement [Member] Underwritten public offering. Underwritten Public Offering [Member] Underwritten Public Offering [Member] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] Proceeds from common stock offering Proceeds from issuance of convertible preferred stock Proceeds From Issuance Of Convertible Preferred Stock Number of common stock issued upon conversion of shares Stock Issued During Period Shares New Issues Public offering price per share Shares Issued Price Per Share Underwriting discounts and estimated offering costs Payments Of Stock Issuance Costs Marketable Securities [Table] Marketable Securities [Table] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] US treasury and other government securities. U.S. Treasury and Other Government Securities [Member] U S Treasury And Oher Government Securities [Member] Financial institution debt securities. Financial Institution Debt Securities [Member] Financial Institution Debt Securities [Member] Corporate Debt Securities [Member] Corporate Debt Securities [Member] Other Asset Backed Securities [Member] Asset Backed Securities [Member] Marketable Securities [Line Items] Marketable Securities [Line Items] Amortized Cost Available For Sale Debt Securities Amortized Cost Basis Gross Unrealized Gains Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Gross Unrealized Losses Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Estimated Fair Value Available For Sale Securities Debt Securities Marketable Securities [Abstract] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Realized gains or losses on marketable securities Marketable Securities Realized Gain Loss Available-for-sales securities, noncurrent, maturing beyond year five. Available-for-sales securities, non-current, maturity period. Available-for-sales Securities, non-current, maturity period Available For Sales Securities Non Current Maturity Period Investments that matured beyond five years Available For Sales Securities Noncurrent Maturing Beyond Year Five 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] Measurement Frequency Fair Value By Measurement Frequency [Axis] Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value on Recurring Basis [Member] Fair Value Measurements Recurring [Member] 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] Level 1 [Member] Fair Value Inputs Level1 [Member] Level 2 [Member] Fair Value Inputs Level2 [Member] Level 3 [Member] Fair Value Inputs Level3 [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] Cash equivalents and restricted cash equivalents Cash And Cash Equivalents Fair Value Disclosure Marketable securities: Marketable securities Investments Fair Value Disclosure Total Assets Fair Value Disclosure Accrued research and development expenses current. Accrued research and development Accrued Research And Development Expenses Current Employee compensation and benefits Employee Related Liabilities Current Accrued legal and professional expenses Accrued Professional Fees Current Accrued other Other Accrued Liabilities Current Total accrued expenses Contract with customer liability additions. Commitments and contingencies. Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Caribou leaseback agreement. Caribou Leaseback Agreement [Member] Caribou Leaseback Agreement [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Payment related to leaseback Contract With Customer Liability Additions Up front payment received. Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Caribou. Caribou [Member] Caribou [Member] Regeneron. Regeneron [Member] Regeneron [Member] Novartis Institutes for BioMedical Research Inc. Novartis [Member] Novartis Institutes For Bio Medical Research Inc [Member] Two thousand sixteen Regeneron Agreement. 2016 Regeneron Agreement [Member] Two Thousand Sixteen Regeneron Agreement [Member] Stock purchase agreement. Stock Purchase Agreement [Member] Stock Purchase Agreement [Member] Two thousand and twenty regeneron amendment. 2020 Regeneron Amendment [Member] Two Thousand And Twenty Regeneron Amendment [Member] Two thousand twenty stock purchase agreement. 2020 Stock Purchase Agreement [Member] Two Thousand Twenty Stock Purchase Agreement [Member] Co-Development and Co-Promotion Agreements. Co-Development and Co-Promotion Agreements [Member] Co Development And Co Promotion Agreements [Member] Regeneron arrangement. Regeneron Agreement [Member] Regeneron Arrangement [Member] Regeneron amendment. Regeneron Amendment [Member] Regeneron Amendment [Member] Novartis arrangement. Novartis Arrangement [Member] Novartis Arrangement [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] Hemophilia Co/Co agreements. Hemophilia Co Co Agreements Hemophilia Co Co Agreements [Member] Non-exclusive license to regeneron under certain Crispr/Cas platform ip. Non-exclusive License to Regeneron under Certain CRISPR/Cas Platform IP [Member] Non Exclusive License To Regeneron Under Certain C R I S P R Cas Platform I P [Member] Option exercised to increase regeneron target cap. Option Exercised to Increase Regeneron Target Cap [Member] Option Exercised To Increase Regeneron Target Cap [Member] Hemophilia Co/Co agreement. Hemophilia Co/Co Agreement [Member] Hemophilia Co Co Agreement [Member] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Research and development services. Research and Development Services [Member] Research And Development Services [Member] Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Upfront payment Up Front Payment Received Increase in accounts receivables. Decrease in accounts receivables. Prospective Adoption Of New Accounting Pronouncements [Abstract] Accounts receivable: Accounts Receivable Net [Abstract] Accounts receivable, Balance at Beginning of Period Accounts receivable, Additions Increase In Accounts Receivables Accounts receivable, Deductions Decrease In Accounts Receivables Accounts receivable, Balance at End of Period Contract liabilities: Contract With Customer Liability [Abstract] Deferred revenue, Balance at Beginning of Period Contract With Customer Liability Deferred revenue, Additions Contract With Customer Liability Cumulative Catch Up Adjustment To Revenue Change In Measure Of Progress Deferred revenue, Deductions Contract With Customer Liability Change In Timeframe Performance Obligation Satisfied Revenue Recognized Deferred revenue, Balance at End of Period Revenue From Contract With Customer [Abstract] Amounts included in the contract liability at the beginning of the period Contract With Customer Liability Revenue Recognized Payments due from affiliates. Deferred revenue additions Collaboration revenue Aggregate transaction price remaining to be recognized, period Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Explanation Payments due Payments Due From Affiliates Aggregate transaction price remaining to be recognized Revenue Remaining Performance Obligation Accounts receivable Accounts Receivable Related Parties Deferred revenue Strategic collaboration agreement amended date. One time payment to novartis. Strategic collaboration agreement amended date Strategic Collaboration Agreement Amended Date One time payment to novartis One Time Payment To Novartis Accounts receivable Accounts Receivable Net Area of space leased. Lessee operating lease lease not yet commenced annual base rent per square foot for first year. Lessee operating lease lease not yet commenced base rent per square foot for last year. Prepaid lease. Accounts receivable billed for long-term contracts or programs additions. Lessee Lease Description [Table] Lessee Lease Description [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Albany Lease. Albany Lease [Member] Albany Lease [Member] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Other Assets [Member] Other Assets [Member] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Area of space leased Area Of Space Leased Operating lease, description Lessee Operating Lease Lease Not Yet Commenced Description Term of lease Lessee Operating Lease Lease Not Yet Commenced Term Of Contract1 Base rent per square foot for first year Lessee Operating Lease Lease Not Yet Commenced Annual Base Rent Per Square Foot For First Year Base rent per square foot for last year Lessee Operating Lease Lease Not Yet Commenced Base Rent Per Square Foot For Last Year Operating lease, liability Operating Lease Liability Incremental borrowing rate Lessee Operating Lease Discount Rate Prepaid lease payments Prepaid Lease Amount receivable on cost of construction and tenant improvement Accounts Receivable Billed For Long Term Contracts Or Programs Additions Letter of credit Line Of Credit Operating lease, existence of option to extend Lessee Operating Lease Lease Not Yet Commenced Existence Of Option To Extend Operating lease, options to extend Lessee Operating Lease Lease Not Yet Commenced Option To Extend 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] 2015 Stock option and incentive plan. 2015 Plan [Member] Two Thousand And Fifteen Stock Option And Incentive Plan [Member] Vesting Vesting [Axis] Vesting Vesting [Domain] First Anniversary of Original Vesting Date [Member] Share Based Compensation Award Tranche One [Member] Two thousand fifteen Plan and Two thousand and sixteen employee stock purchase plan. 2015 Plan and the 2016 Employee Stock Purchase Plan [Member] Two Thousand Fifteen Plan And Two Thousand And Sixteen Employee Stock Purchase Plan [Member] 2016 employee stock purchase plan. 2016 Employee Stock Purchase Plan [Member] Two Thousand And Sixteen Employee Stock Purchase Plan [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 [Member] Restricted Stock [Member] RSUs [Member] Restricted Stock Units R S U [Member] Stock Options [Member] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Vest percentage on the first anniversary Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage Remaining vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Maximum term of stock options granted Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Description of stock options granted under the Plan Share Based Compensation Arrangement By Share Based Payment Award Description Shares available for future issuance Common Stock Capital Shares Reserved For Future Issuance Percentage of cumulative increase in number of shares for future issuance Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Outstanding Stock Maximum Compensation Related Costs [Abstract] 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 [Member] Research And Development Expense [Member] General and Administrative [Member] General And Administrative Expense [Member] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Equity-based compensation expense Allocated Share Based Compensation Expense Share based compensation arrangement by share based payment award equity instruments other than options cancelled in period. Number of Shares, Unvested, Beginning balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Number of Shares, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Number of Shares, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Number of Shares, Cancelled Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period Number of Shares, Unvested, Ending balance Share based compensation arrangement by share based payment award equity instruments other than options cancelled in period weighted average grant date fair value. Weighted Average Grant Date Fair Value per Share, Unvested, Beginning balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value per Share, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value per Share, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value per Share, Cancelled Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value per Share, Unvested, Ending balance Additional vesting of shares Unrecognized equity-based compensation expense related to restricted stock Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Weighted average period of unrecognized compensation costs Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Weighted average grant date fair value per share Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Total intrinsic value of stock options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Risk-free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Expected life of options Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Expected volatility of underlying stock Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Expected dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Number of Options, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Number of options, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Number of options, Exercised Stock Issued During Period Shares Stock Options Exercised Number of options, Forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Number of Options, Outstanding, Ending Balance Number of Options, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted Average Exercise Price per Share, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted Average Exercise Price per Share, Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted Average Exercise Price per Share, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted Average Exercise Price per Share, Forfeited Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Weighted Average Exercise Price per Share, Outstanding, Ending Balance Weighted Average Exercise Price per Share, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted Average Remaining Contractual Term, Outstanding Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted Average Remaining Contractual Term, Exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Aggregate Intrinsic Value, Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value, Exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Unrecognized compensation cost related to stock options Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Net loss 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] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Potential dilutive securities excluded from computation of diluted net loss per common share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Stock issued during period shares vesting restricted units. Stock issued during period value vesting restricted units. Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-In Capital [Member] Additional Paid In Capital [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income [Member] Accumulated Deficit [Member] Retained Earnings [Member] Private Placement [Member] Private Placement [Member] Cumulative Effect, Period of Adoption Cumulative Effect Period Of Adoption [Axis] Cumulative Effect, Period of Adoption Cumulative Effect Period Of Adoption [Domain] Cumulative Effect, Period of Adoption, Adjustment [Member] Cumulative Effect Period Of Adoption Adjustment [Member] Class Of Stock [Line Items] Class Of Stock [Line Items] Beginning balance Beginning balance, shares Accounting Standards Update [Extensible List] Accounting Standards Update Extensible List Issuance of common stock Stock Issued During Period Value New Issues Issuance of common stock, shares Exercise of stock options Stock Issued During Period Value Stock Options Exercised Exercise of stock options, shares Vesting of restricted units Stock Issued During Period Value Vesting Restricted Units Vesting of restricted units, shares Stock Issued During Period Shares Vesting Restricted Units Issuance of shares under employee stock purchase plan Stock Issued During Period Value Employee Stock Purchase Plan Issuance of shares under employee stock purchase plan, shares Stock Issued During Period Shares Employee Stock Purchase Plans Equity-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Other comprehensive income (loss) Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Ending balance Ending balance, shares At The Market Offerings [Member] Stock issuance cost, net Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Percentage of gross proceeds from common stock as sales agent cash commission. Legal, accounting and other fees. Number of remaining shares eligible for sale under agreement value. Two thousand nineteen sales agreement. 2019 Sales Agreement [Member] Two Thousand Nineteen Sales Agreement [Member] General and Administrative Expenses [Member] Percentage of gross proceeds from common stock as sales agent cash commission Percentage Of Gross Proceeds From Common Stock As Sales Agent Cash Commission Common stock price per share Legal accounting and other fees Legal Accounting And Other Fees Proceeds from common stock offering Number Of Remaining Shares Eligible For Sale Under Agreement Value Subsequent Event [Table] Subsequent Event [Table] New car t-cell therapy. New CAR T-Cell Therapy [Member] New C A R T Cell Therapy [Member] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Blackstone life sciences. Blackstone Life Sciences [Member] Blackstone Life Sciences [Member] Underwriting agreements. Underwriting Agreement [Member] Underwriting Agreements [Member] July 2021 offering. July 2021 Offering [Member] July Twenty Twenty One Offering [Member] Tudor Lease. 17 Tudor Lease [Member] Tudor Lease [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Fund amount committed Investment Company Committed Capital Proceeds from common stock offering Underwriting discounts and estimated offering costs Operating lease, description Operating lease, options to extend