100000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 100010 - Statement - CONDENSED BALANCE SHEETS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 100020 - Statement - CONDENSED STATEMENT OF CASH FLOWS (Unaudited) 2 link:presentationLink link:calculationLink link:definitionLink 100030 - Statement - CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 100040 - Statement - CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 100050 - Statement - Statement - CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 100060 - Statement - CONDENSED STATEMENT OF CASH FLOWS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 995455 - Disclosure - Organization and Description of Business link:presentationLink link:calculationLink link:definitionLink 995465 - Disclosure - Basis of Presentation and Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 995475 - Disclosure - Net Loss Per Share link:presentationLink link:calculationLink link:definitionLink 995485 - Disclosure - Fair Value of Financial Instruments link:presentationLink link:calculationLink link:definitionLink 995495 - Disclosure - Balance Sheet Components link:presentationLink link:calculationLink link:definitionLink 995505 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 995515 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 995525 - Disclosure - CRISPR Collaboration Agreement link:presentationLink link:calculationLink link:definitionLink 995535 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 995545 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 995555 - Disclosure - Basis of Presentation and Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 995565 - Disclosure - Net Loss Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 995575 - Disclosure - Fair Value of Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 995585 - Disclosure - Balance Sheet Components (Tables) link:presentationLink link:calculationLink link:definitionLink 995595 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 995605 - Disclosure - Stockholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 995615 - Disclosure - Organization and Description of Business - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995625 - Disclosure - Basis of Presentation and Significant Accounting Polices - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995635 - Disclosure - Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 995645 - Disclosure - Net Loss Per Share - Summarizes the Outstanding Potentially Dilutive Securities Excluded in Calculation of Diluted Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 995655 - Disclosure - Fair Value of Financial Instruments - Summary of Fair Value of Financial Instrument (Details) link:presentationLink link:calculationLink link:definitionLink 995665 - Disclosure - Fair Value of Financial Instruments - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995675 - Disclosure - Fair Value of Financial Instruments - Schedule of Short-term Investments Accounted as Available-for-sale Securities (Details) link:presentationLink link:calculationLink link:definitionLink 995685 - Disclosure - Balance Sheet Components - Schedule of Property and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 995695 - Disclosure - Balance Sheet Components - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995705 - Disclosure - Balance Sheet Components - Schedule of Accrued Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 995715 - Disclosure - Leases - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995725 - Disclosure - Leases - Schedule of Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 995735 - Disclosure - Commitments and Contingencies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995745 - Disclosure - Leases - Schedule of Maturities of Operating Lease Liabilities (Details) 2 link:presentationLink link:calculationLink link:definitionLink 995755 - Disclosure - CRISPR Collaboration Agreement - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995765 - Disclosure - Stockholders' Equity - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995775 - Disclosure - Stockholders' Equity - Summary of Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 995785 - Disclosure - Stockholders' Equity - Summary of Restricted Stock Unit Activity (Details) link:presentationLink link:calculationLink link:definitionLink 995795 - Disclosure - Stockholders' Equity - Summary of Share-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 995805 - Disclosure - Income Taxes - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2025 Lessee, Operating Lease, Liability, to be Paid, Year One Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Document Transition Report Document Transition Report Weighted-average remaining contractual term (in years), outstanding balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Money Market Funds Money Market Funds [Member] 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 Increase in share limit as percentage of outstanding shares of common stock on last trading day in prior year. Stock issuance discounts, commissions and other expenses Stock issuance discounts and commission Issuance costs Number of non-exclusive rights to gene editing targets licenses received Number Of Non Exclusive Rights To Gene Editing Targets licenses received Number of non exclusive rights to gene editing targets licenses received. Paul Hastings Paul Hastings1[Member] Paul Hastings. Net unrealized (loss) gain on investments Unrealized Gain (Loss) on Investments Debt Securities, Available-for-sale, Total Available for sale securities,Estimated Fair Value Debt Securities, Available-for-Sale Other Liabilities, Noncurrent, Total Other long-term liabilities Other Liabilities, Noncurrent Increase (Decrease) in Prepaid Expense and Other Assets, Total Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Weighted average common shares outstanding Weighted Average Number of Shares Issued, Basic Restricted Stock Unit Activity Restricted Stock Units Restricted Stock Units (RSUs) [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Four Operating lease liabilities: Operating Lease, Liability [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Receivable under research cost sharing provision Receivable Under Research Cost Sharing Provision Receivable under research cost sharing provision. Short-term Debt, Type Short-Term Debt, Type [Axis] Alyssa Levin Alyssa Levin [Member] Alyssa Levin. Summary of Share-based Compensation Expense Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Less: weighted average unvested common stock issued upon early exercise of common stock options 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 number of shares unvested common stock issued upon early exercise of common stock options. Contingency loss recorded. Contingency Loss Recorded Contingency loss Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Schedule Of Stock By Class [Table] Schedule of Stock by Class [Table] Initial Lease Agreement And Additional Lease Agreement. Initial Lease Agreement And Additional Lease Agreement [Member] Initial Lease Agreement And Additional Lease Agreement Assets: Assets, Fair Value Disclosure [Abstract] Class Of Stock [Line Items] Class of Stock [Line Items] Amounts owed under the agreement Amounts Owed Under Agreement Amounts owed under agreement. Balance Sheet Location [Axis] Total current assets Assets, Current Total liabilities and stockholders’ equity Liabilities and Equity Entity Address, State or Province Entity Address, State or Province Stock Issued During Period, Value, New Issues Aggregate offering price Issuance of common stock, net of issuance costs Number of shares, outstanding beginning balance Number of shares, outstanding ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 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 Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Trading Symbol Trading Symbol Total prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Numerator: Net Income (Loss) Attributable to Parent [Abstract] Cash and Cash Equivalents [Member] Cash and Cash Equivalents Beginning Balance, Shares Ending Balance, Shares Shares, Outstanding 2027 Lessee, Operating Lease, Liability, to be Paid, Year Three Number of common stock available for issuance Common Stock, Capital Shares Reserved for Future Issuance Accumulated Other Comprehensive Gain/(Loss) AOCI Attributable to Parent [Member] Entity Address, City or Town Entity Address, City or Town Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Pre-funded warrants to purchase shares of common stock Class of Warrant or Right, Outstanding Accrued and Other Current Liabilities Accrued and Other Current Liabilities [Member] Accrued and other current liabilities. Renewal term Lessee, Operating Lease, Renewal Term Rule 10b5-1 Arrangement Modified Rule 10b5-1 Arr Modified [Flag] Rule 10b5-1 Arr Modified Flag. Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Tenant improvement allowance available to utilize Tenant improvement allowance available to utilize. Tenant improvement costs in equal monthly payments annual rate Tenant Improvement Costs Equal Monthly Payments Annual Rate Tenant improvement costs equal monthly payments annual rate. Subsequent Event Subsequent Event [Member] Subsequent Event Type Subsequent Event Type [Axis] Cash, cash equivalents restricted cash and short-term investments Cash Cash Equivalents Restricted Cash And Short Term Investments Cash cash equivalents restricted cash and short term investments. Additional Paid-In Capital Additional Paid-in Capital [Member] Current liabilities Liabilities, Current [Abstract] US Government Corporations and Agencies Securities [Member] U.S. Government securities Current assets Assets, Current [Abstract] Statement of Stockholders' Equity [Abstract] Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] 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 Research Equipment Research Equipment [Member] Research equipment. Operating lease liabilities, current portion Operating Lease, Liability, Current Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Total property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Entity Central Index Key Entity Central Index Key Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of common stock upon vesting of restricted stock units Plan Name Plan Name [Domain] Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Long Term Investments [Member] Long Term Investments [Member] Long Term Investments Add: weighted average of common stock to be issued upon exercise of pre-funded warrants Weighted average of common stock to be issued upon exercise of pre-funded warrants Weighted average of common stock to be issued upon exercise of pre-funded warrants. Weighted-average remaining contractual term (in years), outstanding ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Restricted cash Restricted Cash, Noncurrent Total Assets, Fair Value Disclosure Lessee option to extend description Lessee, Operating Lease, Option to Extend Total current liabilities Liabilities, Current Entity Tax Identification Number Entity Tax Identification Number Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Financial Instruments Financial Instruments [Domain] Construction in Progress Construction in Progress [Member] Issuance of common stock upon employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Leases Lessee, Operating Leases [Text Block] Restricted Stock Restricted Stock [Member] Stock issuance costs included in accrued and other current liabilities Non Cash Or Part Of Non Cash Stock Issuance Costs Included In Accrued And Other Current Liabilities Non cash or part of non cash stock issuance costs included in accrued and other current liabilities. Plan Name Plan Name [Axis] Letter of credit notice period by financial institution before annual expiration date Letter Of Credit Notice Period By Financial Institution Before Annual Expiration Date Letter of credit notice period by financial institution before annual expiration date. Lessee, operating lease, term of contract Lessee, Operating Lease, Term of Contract Total assets Assets Investment Income, Net, Total Interest income Investment Income, Net Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Entity Registrant Name Entity Registrant Name Operating lease, existence of option to extend Lessee, Operating Lease, Existence of Option to Extend [true false] Lessee Lease Description [Line Items] Lessee, Lease, Description [Line Items] Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Accumulated deficit Accumulated deficit Retained Earnings (Accumulated Deficit) Supplemental Cash Flow Information [Abstract] Supplemental disclosures of non-cash investing activities: Accumulated Deficit Retained Earnings [Member] Number of shares, outstanding ending balance Number of shares, outstanding beginning balance Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Issuance of common stock upon employee stock purchase plan, Shares Stock Issued During Period, Shares, Employee Stock Purchase Plans Minimum Minimum [Member] Minimum [Member] Proceeds from stock option exercises Proceeds from Stock Options Exercised Basis of Presentation and Significant Accounting Policies Significant Accounting Policies [Text Block] Total operating lease liabilities Total lease liability Operating Lease, Liability Corporate Debt Securities Corporate Debt Securities One [Member] Corporate debt securities one. US Government Agencies Debt Securities [Member] U.S. Government securities Equity Component Equity Component [Domain] Change in Accounting Principle, Accounting Standards Update, Adoption Date Change in Accounting Principle, Accounting Standards Update, Adoption Date 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] Entity Current Reporting Status Entity Current Reporting Status Research and Development Expense, Total Research and development Research and Development Expense Lease expiration month and year Lease Expiration Month And Year Lease expiration month and year. Assets Assets [Abstract] Gross proceeds from offering Proceeds from Issuance of Common Stock Accrued interest receivable Interest Receivable, Current Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common stock Common Stock, Value, Issued Furniture and Fixtures Furniture and Fixtures [Member] Accrued Liabilities, Current, Total Accrued and other current liabilities Accrued Liabilities, Current Second amendment of additional lease agreement. Second Amendment Of Additional Lease Agreement [Member] Second Amendment Of Additional Lease Agreement Current Fiscal Year End Date Current Fiscal Year End Date Share-based Payment Arrangement, Noncash Expense, Total Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Loss from operations Operating Income (Loss) ASU 2019-12 Accounting Standards Update 2019-12 [Member] Debt Securities, Available-for-sale, Realized Gain (Loss), Total Realized gain or loss on available-for-sale securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Realized gain on investments Expects to pay base rent over the lease term Expected Base Rent Over Lease Term Expected base rent over the lease term. Entity Ex Transition Period Entity Ex Transition Period Cash received for operating leases Proceeds from Lease Payment, Operating Activity Income Tax Expense (Benefit), Total Provision for income taxes Income Tax Expense (Benefit) Research and Development Research and Development Expense [Member] Share-based compensation expense Share-Based Payment Arrangement, Expense Operating lease liabilities Operating lease liabilities Increase (Decrease) in Operating Lease Liability Leone Patterson Leone Patterson [Member] Leone Patterson. Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting policies. Long-Lived Asset Impairment Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Aggregate intrinsic value, outstanding balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Reconciliation of cash, cash equivalents and restricted cash to the balance sheet: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Net Loss Per Share Earnings Per Share, Policy [Policy Text Block] Lease expiration year Lease Expiration Year Lease expiration year. Corporate Office and Laboratory Space Corporate Office And Laboratory Space [Member] Corporate office and laboratory space. Other (expense) income, net Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense) Common stock price Sale of Stock, Price Per Share Operating expenses Operating Expenses [Abstract] Other offering expenses Payments of Other Offering Expenses Payments of other offering expenses. Depreciation, Depletion and Amortization, Nonproduction, Total Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive loss: Schedule of Short-term Investments Debt Securities, Available-for-Sale [Table Text Block] Specified TA. Specified TA [Member] Specified TA Commitments and Contingencies Disclosure [Abstract] Other Assets, Noncurrent, Total Other long-term assets Other Assets, Noncurrent Number of shares, granted Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Stockholders' Equity Equity [Text Block] Accounting Policies [Table] Accounting Policies [Table] Accounting policies. Available for sale securities, Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Stockholders’ equity Equity, Attributable to Parent [Abstract] 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] Ralph Brandenberger Ralph Brandenberger [Member] Ralph Brandenberger. Noncash or part noncash acquisition fixed assets acquired included in accounts payable and accrued and other current liabilities. Noncash Or Part Noncash Acquisition Fixed Assets Acquired Included In Accounts Payable And Accrued And Other Current Liabilities Acquisitions of property and equipment in accounts payable and accrued and other current liabilities Lease Contractual Term Lease Contractual Term [Domain] Earnings Per Share [Abstract] Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Accounting Policies [Abstract] Lessee Lease Description [Table] Lessee, Lease, Description [Table] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Payments for Rent Rent payments Lease term Lessee, Operating Lease, Remaining Lease Term Earnings Per Share, Basic, Total Earnings Per Share, Basic Net loss per share, basic Cash Equivalents, at Carrying Value Total cash equivalents Commitments and contingencies (Note 7) Commitments and Contingencies Available-for-sale securities, Maturity (in years) Debt Securities, Available-for-Sale, Term Income Statement [Abstract] Tenant improvement allowance repayment Payments for (Proceeds from) Tenant Allowance 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 Statistical Measurement Statistical Measurement [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities NK Cell Products N K Cell Products [Member] NK cell products. Document Period End Date Document Period End Date Statistical Measurement Statistical Measurement [Axis] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Stockholders' Equity Note [Abstract] Cash paid for operating leases Operating Lease, Payments Amount held as collateral for letters of credit issued to landlord. Amount held as collateral for letters of credit issued to landlord Amount held as collateral for letters of credit issued to landlord Amount paid under the agreement Payments Made Under Collaborative Arrangement Payments made under collaborative arrangement. Earnings Per Share, Diluted, Total Earnings Per Share, Diluted Net loss per share, diluted Product and Service Product and Service [Domain] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Number of shares, exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Reserved for Future Equity Award Grants 2020 Plan Two Thousand Twenty Performance Incentive Plan [Member] Two thousand twenty performance incentive plan. Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Additional Paid in Capital, Common Stock Issuance of common stock upon exercise of stock options, Shares Number of shares, exercised Number of shares, exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Common Stock Options Common Stock Options [Member] Common stock options. Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Interactive Data Current Entity Interactive Data Current Private Placement [Member] Secondary Offering Current Corporate Offices and Laboratory Space Current Corporate Offices And Laboratory Space [Member] Current corporate offices and laboratory space. Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Proceeds from issuance of common stock and pre-funded warrants, net of underwriting fees Proceeds From Issuance Of Common Stock And Pre-funded Warrants, Net Of Underwriting Fees Proceeds from issuance of common stock and pre-funded warrants, net of underwriting fees. Number of shares, granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Weighted-average exercise price, exercised Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Accumulated Other Comprehensive (Income) Loss Equity Components [Axis] Sale of Common Stock and Pre-funded Warrants Sale of Common Stock and Pre-funded Warrants [Member] Sale of common stock and pre-funded warrants. Reduction of research and development expense resulting from partial reimbursement Reduction Of Research And Development Expense Resulting From Partial Reimbursement Reduction of research and development expense resulting from partial reimbursement. Proceeds from Sale, Maturity and Collection of Investments, Total Proceeds from Sale, Maturity and Collection of Investments Maturities of investments 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 Local Phone Number Local Phone Number Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] Sale of Stock Sale of Stock [Axis] Weighted-average exercise price, exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Maximum monthly base rent after increase on annual basis Maximum Monthly Base Rent After Increase on Annual Basis Maximum monthly base rent after increase on annual basis. Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of common stock upon vesting of restricted stock units, Shares Statement of Cash Flows [Abstract] Employee contributions to ESPP Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP Initial lease agreement. Initial Lease Agreement [Member] Initial Lease Agreement Organization, Consolidation and Presentation of Financial Statements [Abstract] Accumulated other comprehensive (loss) income Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Other accrued and current liabilities Accounts Payable and Other Accrued Liabilities, Current Vesting of shares of common stock subject to repurchase Stock Issued During Period Value Vesting Of Shares Of Common Stock Subject To Repurchase Stock issued during period value vesting of shares of common stock subject to repurchase. Unrecognized compensation cost, expected to be recognized over weighted average remaining service period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Weighted-average remaining contractual term (in years), vested and expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Number of common stock authorized for issuance Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] CRISPR Collaboration Agreement Collaborative Arrangement Disclosure [Text Block] Maximum Maximum [Member] Organization and Description of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Short-term Debt, Type Short-Term Debt, Type [Domain] Net increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect General and Administrative General and Administrative Expense [Member] Number of shares, forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period 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 [Table Text Block] Additional tenant improvement allowances. Additional Tenant Improvement Allowances Additional tenant improvement allowances Summary of Fair Value of Financial Instrument Fair Value, by Balance Sheet Grouping [Table Text Block] City Area Code City Area Code Research and Development Arrangement, Contract to Perform for Others, Type Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Letter of Credit Letter of Credit [Member] Paul Hastings Paul Hastings [Member] Paul Hastings. Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment General and Administrative Expense, Total General and administrative General and Administrative Expense Weighted Average Number of Shares Outstanding, Basic, Total Weighted Average Number of Shares Outstanding, Basic Weighted average shares used to compute net loss per share, basic Research and Development Arrangement, Contract to Perform for Others, Type Research and Development Arrangement, Contract to Perform for Others, Type [Domain] 2020 Employee Stock Purchase Plan Employee Stock [Member] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Lessee, Operating Lease, Description Operating lease, description Summary of Restricted Stock Unit Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Statement [Table] Statement [Table] Summary of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Total undiscounted future minimum lease payments Lessee, Operating Lease, Liability, to be Paid 2026 Lessee, Operating Lease, Liability, to be Paid, Year Two Statement [Line Items] Statement [Line Items] Us government corporations and agencies securities one. US Government Corporations and Agencies Securities One [Member] U.S. Government securities Antidilutive securities excluded from computation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Collaboration Agreement [Abstract] Collaboration agreement. Letters of credit outstanding amount Letters of Credit Outstanding, Amount 2020 Plan and 2015 Plan Two Thousand Twenty Performance Incentive And Two Thousand Fifteen Equity Incentive Plan [Member] Two thousand twenty performance incentive and two thousand fifteen equity incentive plan. Common Stock Common Stock [Member] Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Computers and Software Computers And Software [Member] Computers and software. Aggregate intrinsic value, exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Accretion and amortization of premiums and discounts on investments, net Accretion (Amortization) of Discounts and Premiums, Investments Vesting of shares of common stock subject to repurchase, Shares Stock Issued During Period Shares Vesting Of Shares Of Common Stock Subject To Repurchase Stock issued during period shares vesting of shares of common stock subject to repurchase. Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Alicia Hager Alicia Hager [Member] Alicia Hager. Cover [Abstract] Offering period Share Based Compensation Arrangement By Share Based Payment Award Offering Period Share based compensation arrangement by share based payment award offering period. Document Fiscal Year Focus Document Fiscal Year Focus Sale of Stock Sale of Stock [Domain] 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 Security Exchange Name Security Exchange Name Total long-term investments Long-Term Investments Long-Term Investments Long-term investments Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Potential future payments Potential Future Payments Based On Achievement Of Milestones Potential future payments based on achievement of milestones. Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross Total property and equipment, gross Weighted-average exercise price, forfeited Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Financial Instrument Financial Instrument [Axis] Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Monthly base rent Monthly Base Rent Monthly base rent. Issuance of common stock upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Entity Emerging Growth Company Entity Emerging Growth Company Intrinsic value of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Amendment Flag Amendment Flag Marketable Securities, Current, Total Marketable securities Marketable Securities, Current IPO [Member] IPO Accrued stock issuance costs Accrued stock issuance costs. Available for sale securities, Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Accounting Standards Update Accounting Standards Update [Domain] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Development and Regulatory Approval Milestones Development and Regulatory Approval Milestones [Member] Development and regulatory approval milestones. Leases [Abstract] Entity File Number Securities Act File Number Cash received for tenant improvement allowances to be repaid Cash Received for Tenant Improvement Allowances to be Repaid Cash received for tenant improvement allowances to be repaid. Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Research Collaboration Agreement Research Collaboration Agreement [Member] Research collaboration agreement. Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] 2024 (remaining nine months) 2021 (remaining three months) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Non-Rule 10b5-1 Arrangement Modified NonRule10B51ArrModifiedFlag Non-Rule 10b5-1 Arr Modified [Flag] Non-Rule 10b5-1 ArrModified Flag. Aggregate intrinsic value, vested and expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Unrealized gain (loss) on investments Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance Total cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Balance Sheet Related Disclosures [Abstract] Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Weighted-average grant date fair value per share, outstanding ending balance Weighted-average grant date fair value per share, outstanding beginning balance Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Total operating expenses Operating Expenses Third amendment Third Amendment [Member] Third amendment. Entity Address, Address Line Two Entity Address, Address Line Two Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Number of operating segments Number of Operating Segments Investment Type Investment Type [Axis] Exercise price of warrants Class of Warrant or Right, Exercise Price of Warrants or Rights Number of non-exclusive rights to gene editing targets Number of Non Exclusive Rights to Gene Editing Targets Number of non exclusive rights to gene editing targets. Payments to Acquire Investments, Total Payments to Acquire Investments Purchases of investments Purchases of investments Class of Warrant or Right [Domain] Net Loss Per Share Earnings Per Share [Text Block] Commercial Paper Commercial Paper [Member] Entity Address, Address Line One Entity Address, Address Line One Investments Cash and Cash Equivalents, Fair Value Disclosure Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Antidilutive Securities Antidilutive Securities [Axis] At the market offering At The Market Offering [Member] ATM Offering Program At-The-Market Offering Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Restricted Cash, Total Restricted cash Restricted Cash Pre-funded warrant Pre-Funded Warrant [Member] Pre-funded warrant. Subsequent Event Type Subsequent Event Type [Domain] March 2024 Offering March Two Thousand Twenty Four Offering [Member] March 2024 offering. Income Statement Location Income Statement Location [Axis] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Shares issued Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Depreciation, Depletion and Amortization, Total Depreciation and amortization expense Depreciation, Depletion and Amortization Product and Service Product and Service [Axis] Title of 12(b) Security Title of 12(b) Security Accrued research and development costs Accrued Research And Development Costs Current Accrued research and development costs current. Agreement with Financial Institution Agreement With Financial Institution [Member] Agreement with financial institution. Lease Contractual Term Lease Contractual Term [Axis] Maximum percentage of employee compensation eligible for plan Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Employee Subscription Rate Money market funds Money Market Funds, at Carrying Value Investments Investments [Domain] Accounting Standards Update Accounting Standards Update [Axis] Accounts payable and accrued and other liabilities Increase Decrease In Accounts Payable And Accrued And Other Liabilities Increase (Decrease) in accounts payable and accrued and other liabilities. Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Total accrued and other liabilities Accounts Payable and Accrued Liabilities, Current Long-Term Line of Credit, Total Long-Term Line of Credit Letter of credit Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Unvested Common Stock Upon Early Exercise of Common Stock Options Unvested Common Stock Upon Early Exercise Of Common Stock Options [Member] Unvested common stock upon early exercise of common stock options. Liabilities recorded for agreements Guarantor Obligations, Current Carrying Value Commercial Paper, at Carrying Value Commercial paper Cash and Cash Equivalents Cash and Cash Equivalents [Axis] Weighted-average remaining contractual term (in years), exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Shares subject to repurchase Stock Repurchase Program, Number of Shares Authorized to be Repurchased Weighted-average grant date fair value per share, Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Income Statement Location Income Statement Location [Domain] Weighted-average exercise price, granted Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Document Type Document Type 2029 and thereafter Lessee Operating Lease Liability Payments Due Year Five And Thereafter Lessee operating lease liability payments due year five and thereafter. Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Document Quarterly Report Document Quarterly Report Security deposit Security Deposit Number of shares, forfeited Number of shares, forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Short-term investments Short-Term Investments [Member] Entity Filer Category Entity Filer Category Balance Sheet Location [Domain] Right-of-use asset impairment Impairment of right-of-use assets Operating Lease, Impairment Loss Short-term Investments, Total Total short-term investments Short-Term Investments Short-term investments Total other income, net Nonoperating Income (Expense) Unrealized gain (loss) on investments, net Total liabilities Liabilities Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Tenant improvement allowances yet to receive Tenant Improvements Yet To Receive From Lessor Tenant improvements yet to receive from lessor. COVID-19 Pandemic Unusual Or Infrequent Items Disclosure Policy [Text Block] Unusual or infrequent items disclosure. Total stockholders’ equity Beginning Balance Ending Balance Equity, Attributable to Parent Net loss Net loss Other income, net: Nonoperating Income (Expense) [Abstract] Accrued property and equipment Accrued Property And Equipment Liabilities Current Accrued property and equipment liabilities current. Proceeds from issuance initial public offering Proceeds from Issuance Initial Public Offering Cash and Cash Equivalents Cash and Cash Equivalents [Domain] Corporate Debt Securities Corporate Debt Securities [Member] Statement of Financial Position [Abstract] Weighted Average Number of Shares Outstanding, Diluted, Total Weighted Average Number of Shares Outstanding, Diluted Weighted average shares used to compute net loss per share, diluted Non-cash lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Schedule of Accrued Other Current Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Available for sale securities, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Weighted-average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Commons stock purchase price as percentage of fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Use of Estimates Use of Estimates, Policy [Policy Text Block] Income Taxes Income Tax Disclosure [Text Block] Weighted-average exercise price, outstanding beginning balance Weighted-average exercise price, outstanding ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Computation of Basic and Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Leasehold Improvements Leasehold Improvements [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Fair Value Disclosures [Abstract] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Payments to Acquire Property, Plant, and Equipment, Total Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Number of shares, Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Number of shares, Vested Common stock shares issued and sold Commonstock available or issuance Issuance of common stock, net of issuance costs, Shares Employee-related Liabilities, Current, Total Accrued compensation Employee-related Liabilities, Current Rent expense Operating Lease, Expense Provision for loss contingency. Provision For Loss Contingency Provision for contingency loss Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash, cash equivalents, and restricted cash beginning of period Cash, cash equivalents, and restricted cash end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Class of Warrant or Right [Axis] Income Tax Disclosure [Abstract]