2024 Lessee, Operating Lease, Liability, to be Paid, Year One Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Industrial Industrial Property [Member] Document Transition Report Document Transition Report Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Weighted-Average Remaining Contractual Life (years), Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Money Market Funds Money Market Funds [Member] Geographical Geographical [Axis] Changes in Estimated Fair Value of Level 3 Financial Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Accrued paid time off Accrued Vacation, Current Debt Securities, Available-for-Sale, Total Estimated Fair Value Debt Securities, Available-for-Sale Commencement Dates, Ending Operating Lease Commencement Ending Month And Year Operating lease commencement ending month and year. Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Unvested RSUs Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Other Assets Other Assets [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Other accrued compensation Accrued Compensation Other Accrued compensation other. 2027 Lessee, Operating Lease, Liability, to be Paid, Year Four Weighted-Average Weighted Average [Member] Fair Value Measurements Fair Value Disclosures [Text Block] Fair value measurement input expected term (years) Success Payment Liability Expected Term Success payment liability expected Term. Beam Therapeutics Inc. (Beam) Beam Therapeutics Incorporated [Member] Beam Therapeutics Inc. Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Unrecognized stock-based compensation expense (in thousands) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Schedule Of Business Acquisitions By Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Loss on lease termination Gain (Loss) on Termination of Lease Fair value less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Acquisition Agreement Acquisition Agreement [Member] Acquisition agreement. Subsequent Event Subsequent Events [Text Block] Restricted Cash Restricted Assets Disclosure [Text Block] Accrued research and development services Accrued Research And Development Services Current Accrued research and development services current. Fair Value Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Schedule Of Stock By Class [Table] Schedule of Stock by Class [Table] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Class Of Stock [Line Items] Class of Stock [Line Items] Office/Laboratory Office And Laboratory [Member] Office and Laboratory. 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Schedule of Various Thresholds for Market Capitalizations Resulting Potential Success Payment and Additional Potential Contingent Consideration Schedule Of Market Capitalizations Table [Text Block] Tabular disclosure of the various thresholds for the Company’s market capitalizations as of the date of a change of control and the resulting potential Cobalt Success Payment and additional potential Cobalt Contingent Consideration. 2026 Lessee, Operating Lease, Liability, to be Paid, Year Three Number of shares available for future issuance Common Stock, Capital Shares Reserved for Future Issuance Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Acquisitions Business Combination Disclosure [Text Block] Entity Address City Or Town Entity Address, City or Town Weighted-average incremental borrowing rate Operating Lease, Weighted Average Discount Rate, Percent Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Subsequent Event Subsequent Event [Member] Subsequent Subsequent Event Type [Axis] Weighted-Average Exercise Price per Share, Forfeited/Cancelled Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Additional Paid-in Capital Additional Paid-in Capital [Member] Upfront payment to collaborators Upfront Payment To Collaborators Upfront payment to collaborators. Current liabilities: Liabilities, Current [Abstract] Fair value 12 months or greater Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Current assets: Assets, Current [Abstract] Counterparty Name Counterparty Name [Axis] Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Statement of Stockholders' Equity [Abstract] Less: current portion of operating lease liabilities Operating lease liabilities Operating Lease, Liability, Current Summary of Estimated Fair Value of Liabilities using Unobservable Inputs Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Contingent consideration Contingent Consideration [Member] Contingent consideration. 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Award Type Award Type [Axis] Unvested Restricted Common Stock Restricted Stock Restricted Stock [Member] Description Of Organization [Table] Description Of Organization [Table] Description of organization. Share-Based Payment Arrangement, Disclosure [Abstract] Market Capitalization Equal to or exceeds $6.8 billion, but less than $7.4 billion Market Capitalization Three [Member] Market Capitalization Three. Plan Name Plan Name [Axis] Geographical Geographical [Domain] TOTAL ASSETS Assets Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Estimated fair value of success payment liability Estimated fair value of success payment liability Estimated Fair Value Of Success Payment Liability Estimated fair value of Success payment liability. 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SUPPLEMENTAL CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Nonvested Restricted Stock Shares Activity [Table Text Block] Summary of RSU Activity Accumulated Deficit Retained Earnings [Member] Unvested shares as of September 30, 2023 Unvested shares as of December 31, 2022 Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Multiple of Equity Value at Issuance, 10x Milestone Two [Member] Milestone two. 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Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 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] Measurement Frequency Measurement Frequency [Axis] Weighted-Average Exercise Price per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Net income (loss) attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Entity Current Reporting Status Entity Current Reporting Status Common stock, shares authorized Common Stock, Shares Authorized Research and Development Expense, Total Research and development Research and Development Expense Fair Value By Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Market Capitalization Less than $6.8 billion Market Capitalization Four [Member] Market capitalization four. Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] ASSETS Assets [Abstract] Proceeds from Issuance of Common Stock Net proceeds from issuance of common stock Proceeds from issuance of common stock, net Expected Term (Years) Measurement Input, Expected Term [Member] Cobalt success payment Cobalt success payment Maximum Potential Success Payments Maximum potential success payments. Real Estate, Type of Property Real Estate, Type of Property [Axis] Common stock, $0.0001 par value; 750,000 shares authorized; 197,064 and 191,022 shares issued and outstanding as of September 30, 2023 and December 31, 2022, respectively Common Stock, Value, Issued Accrued liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Other Noncash Income (Expense), Total Other non-cash items, net Other Noncash Income (Expense) Significant accounting policies Significant Accounting Policies Policy [Text Block] Significant accounting policies. Current Fiscal Year End Date Current Fiscal Year End Date Share-Based Payment Arrangement, Noncash Expense, Total Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Operating Income (Loss), Total Loss from operations Operating Income (Loss) Entity Ex Transition Period Entity Ex Transition Period License And Collaboration Agreements [Abstract] License and collaboration agreements. Research and Development Expense Research and Development Expense Research and Development Expense [Member] Organization Nature of Operations [Text Block] Total stock-based compensation expense Share-Based Payment Arrangement, Expense Expected volatility, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Indefinite-Lived Intangible Assets Indefinite-Lived Intangible Assets [Axis] Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Measurement Input Type Measurement Input Type [Domain] Maximum term for success payment Business Acquisition Maximum Term For Success Payment Maximum​ term for success payment. Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Sana Parent Company [Member] Other income (expense), net Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense) Estimated fair value of contingent consideration, long-term liabilities Contingent consideration, net of current portion Business Combination, Contingent Consideration, Liability, Noncurrent Changes in fair value – expense (gain) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Estimated fair value of contingent consideration Estimated Fair Value Of Contingent Consideration Estimated fair value of contingent consideration. 2021 Employee Stock Purchase Plan Two Thousand Twenty One Employee Stock Purchase Plan [Member] 2021 Employee Stock Purchase Plan. Property, Plant and Equipment [Abstract] Subsequent Events [Abstract] Aggregated consideration paid Total Value Of Consideration Paid Under License Agreement Total value of consideration paid under license agreement. Schedule Of Restricted Cash And Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Commitments and Contingencies Disclosure [Abstract] Other non-current assets Other Assets, Noncurrent Stock Options, Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Other accrued current liabilities Other Accrued Liabilities, Current Stockholders' Equity Equity [Text Block] Depreciation, Total Depreciation expense Depreciation Depreciation Accrued payroll Accrued Salaries, Current Additional Paid in Capital, Total Additional paid-in capital Additional Paid in Capital Gross Unrealized Holding 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] Summary of Lease Costs Lease, Cost [Table Text Block] Fair value measurement input Success Payment Liability Measurement Input Success payment liability measurement input. Contingent Consideration Contingent Consideration Liability [Member] Contingent consideration liability. Office/Laboratory/Industrial Office Laboratory And Industrial [Member] Office, laboratory and industrial. Earnings Per Share [Abstract] OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total Unrealized gain (loss) on marketable securities, net OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Reconciliation of Undiscounted Operating Lease Cash Flows by Fiscal Year to Present Value of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Indefinite-Lived Intangible Assets, Major Class Name Indefinite-Lived Intangible Assets, Major Class Name [Domain] Multiple of Equity Value at Issuance, 5x Milestone One [Member] Milestone one. Accounting Policies [Abstract] Lessee Lease Description [Table] Lessee, Lease, Description [Table] Liability Class Liability Class [Axis] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Lease termination fees incurred Lease Termination Fees Incurred Lease termination fees incurred. Net income (loss) per common share - basic Basic earnings (loss) per common share Earnings Per Share, Basic, Total Earnings Per Share, Basic Long-term Financial Liabilities Long Term Financial Liabilities [Member] Long term financial liabilities. Cobalt Cobalt Success Payment Liability Cobalt Success Payment Liability [Member] Cobalt success payment liability. Commitments and contingencies (Note 9) Commitments and Contingencies Business Combinations [Abstract] Income Statement [Abstract] Harvard College Harvard College [Member] Harvard College. Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Change in the estimated fair value of success payment liabilities Change In Fair Value Of Success Payment Liabilities Change in fair value of success payment liabilities. Operating lease cost Operating Lease, Cost Short-term Marketable Securities Short Term Marketable Securities [Member] Short-term marketable securities. Square feet Area Of Leased Space Area of leased space. Change in the estimated fair value of contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Retirement Benefits [Abstract] Description Of Organization [Line Items] Description Of Organization [Line Items] Description of organization. Measurement Input Type Measurement Input Type [Axis] Statistical Measurement Statistical Measurement [Domain] Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Future letter of credit amount Future Letter Of Credit Amount Future letter of credit amount. Rochester, NY Rochester New York [Member] Rochester New York. Award Type All Award Types Document Period End Date Document Period End Date Statistical Measurement Statistical Measurement [Axis] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Net income (loss) per common share - diluted Diluted earnings (loss) per common share Earnings Per Share, Diluted, Total Earnings Per Share, Diluted Less: tenant improvement allowances Lessee Operating Lease Liability Tenant Improvement Allowance Lessee operating lease liability tenant improvement allowance. Lease, Cost [Abstract] Lease, Cost [Abstract] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Stock Options Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Probability of Milestone Achievement Measurement Input Probability Of Milestone Achievement [Member] Measurement input probability of milestone achievement. Fair Value, Recurring Fair Value, Recurring [Member] Derecognition of operating lease right-of-use asset for lease termination Derecognition Of Operating Lease Right-of-use Asset For Lease Termination Derecognition of operating lease right-of-use asset for lease termination. Stock Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Stock Options, Exercised Exercise of stock options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Multiple of Equity Value at Issuance, 30x Milestone Four [Member] Milestone four. Success Payment Liabilities Success Payment Liabilities [Member] Success payment liabilities. LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Multiple of Equity Value at Issuance, 20x Milestone Three [Member] Milestone three. IPR&D In Process Research And Development Intangible Asset [Member] In process research and development intangible asset. Entity Address Postal Zip Code Entity Address, Postal Zip Code Entity Interactive Data Current Entity Interactive Data Current Discount Rates Measurement Input, Discount Rate [Member] Increase (Decrease) in Accounts Payable, Total Accounts payable Increase (Decrease) in Accounts Payable Real Estate Real Estate [Domain] Summary of Estimated Fair Value Available For Sale Debt Securities Continuous Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Equity [Abstract] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Weighted-Average Exercise Price per Share, Exercised Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Entity Incorporation State Country Code Entity Incorporation, State or Country Code Basic earnings per common share: Earnings Per Share, Basic [Abstract] Equity Components Equity Components [Axis] Schedule of Unrecognized Stock-Based Compensation Costs Related to Unvested Awards and Weighted-Average Period Over Which Costs are Expected to be Recognized Share-Based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Employee Benefit Plan Retirement Benefits [Text Block] Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Cobalt Contingent Consideration Cobalt Contingent Consideration Liability [Member] Cobalt contingent consideration liability. 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Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] APIC, Share-Based Payment Arrangement, Increase for Cost Recognition, Total Stock-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] Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Schedule of Additional Information Related to Operating Leases Operating Leases Additional Information Table [Text Block] Operating leases additional information. Payables and Accruals [Abstract] General and administrative General and Administrative Expense [Member] Stock options and restricted stock units Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Bothell, WA Bothell, Washington Bothell Washington [Member] Bothell, Washington. South San Francisco, CA CALIFORNIA Accrued compensation: Employee-related Liabilities, Current [Abstract] Anti-dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] City Area Code City Area Code OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Business Acquisition [Line Items] Business Acquisition [Line Items] 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 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 common shares - basic Weighted Average Number of Shares Outstanding, Basic, Total Weighted-average number of common shares - basic Weighted Average Number of Shares Outstanding, Basic FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Statement [Table] Statement [Table] Summary of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Contingent Consideration Type Contingent Consideration Type [Domain] Additional potential Cobalt Contingent Consideration Additional Potential Contingent Consideration Additional potential contingent consideration. Schedule of Assumptions Used in Black-Scholes Option-Pricing Model for Estimating Fair Value of Stock Options Granted Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Total undiscounted lease payments Obligation to pay base rent Lessee, Operating Lease, Liability, to be Paid Multiple of Equity Value at Issuance, 40x Milestone Five [Member] Milestone five. 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Accrued professional fees Accrued Professional Fees, Current Statement [Line Items] Statement [Line Items] Restricted Cash and Cash Equivalents [Abstract] Anti-dilutive securities excluded from computation of dilutive net loss per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Beginning Balance Ending Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Total lease cost Lease, Cost Subsequent Event [Line Items] Letter of credit Letters of Credit Outstanding, Amount Asset Class Asset Class [Domain] Increase decrease in operating lease right-of-use liabilities Increase Decrease In Operating Lease Right Of Use Liabilities Increase decrease in operating lease right of use liabilities. Common Stock Common Stock [Member] Developmental and commercial milestone payments and royalties on licensed products payable Potential Amount Of Milestone Payments And Royalties Payable Potential amount of milestone payments and royalties payable. Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Schedule of Stock Based Compensation Expense Recognized Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Long-term Marketable Securities Long Term Marketable Securities [Member] Long-term marketable securities. Summary of Additional Information Related to Stock Option Activity Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Financial Liabilities Liability [Member] Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Threshold market capitalization Threshold Market Capitalization Threshold market capitalization. Cover [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Optional additional tenant improvement allowance, interest rate Optional Tenant Improvement Allowance Interest Rate Optional tenant improvement allowance interest rate. Sale of Stock Sale of Stock [Domain] Optional additional tenant improvement allowance Optional Tenant Improvement Allowance Optional additional tenant improvement allowance. Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-Based Payment Arrangement, Recognized Amount [Abstract] Harvard Harvard Success Payment Liability Harvard Success Payment Liability [Member] Harvard Success Payment Liability. Security Exchange Name Security Exchange Name Recent accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares authorized Preferred Stock, Shares Authorized Investments in securities with maturities period Investments Securities Maturities Period Investments securities maturities period. Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Property and equipment, at cost Property, Plant and Equipment, Gross Operating lease right-of-use assets and liabilities Increase Decrease In Operating Lease Right Of Use Assets And Liabilities Amount of increase decrease in operating lease right-of-use assets and operating lease liabilities. Short-term Financial Liabilities Short Term Financial Liabilities [Member] Short term financial liabilities. Operating lease right-of-use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Business Acquisition, Acquiree Business Acquisition, Acquiree [Domain] Common stock maximum aggregate offering price Common Stock Maximum Offering Amount Common stock maximum offering amount. Financial Instrument Financial Instrument [Axis] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Entity Emerging Growth Company Entity Emerging Growth Company Aggregate intrinsic value of stock options exercised (in thousands) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Business acquisition, percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Restricted Cash And Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Amendment Flag Amendment Flag Vesting of restricted stock Stock Issued During Period, Value, Restricted Stock Award, Gross Schedule of Accrued Compensation and Accrued Expenses and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] Marketable securities Marketable Securities, Current Investments and Cash, Total Cash, cash equivalents and marketable securities Investments and Cash Gross Unrealized Holding Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Cash received for amounts related to tenant improvement allowances Cash Received For Amounts Related To Tenant Improvement Allowances Cash received for amounts related to tenant improvement allowances. Basis of presentation Basis of Accounting, Policy [Policy Text Block] Market Capitalization Equal to or Exceeds $8.1 billion Market Capitalization One [Member] Market capitalization one. Total fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Entity File Number Securities Act File Number Summary of Potential Success Payments Summary Of Potential Success Payments Harvard Table [Text Block] Summary of potential success payments and common stock price required for payment to Harvard. Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Per share common stock price required for payment Common Stock Price Per Share Required For Payment Common stock price per share required for payment. Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] 2023 (remaining 3 months) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Aggregate Intrinsic Value, Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Unrealized gain (loss) on marketable securities, net OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash Equivalents Cash Equivalents [Member] Share-Based Payment Arrangement [Abstract] Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Unvested shares as of September 30, 2023 Unvested shares as of December 31, 2022 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 Total accrued expenses and other current liabilities Accrued expenses and other current liabilities Accrued Liabilities and Other Liabilities Expected term (years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Entity Address, Address Line Two Entity Address, Address Line Two Preferred stock, $0.0001 par value; 50,000 shares authorized; zero shares issued and outstanding as of September 30, 2023 and December 31, 2022 Preferred Stock, Value, Issued Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Accrued bonuses Accrued Bonuses, Current Weighted-Average Grant Date Fair Value per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Computer Equipment, Software and Other Computer Equipment [Member] Common stock shares issued Stock Issued During Period Value Common Stock In Connection With License Agreement Stock issued during period, value, common stock in connection with license agreement. Net Income (Loss) Per Share Earnings Per Share [Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Total Stock Options, Forfeited/Cancelled Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period 2021 Incentive Award Plan Two Thousand Twenty One Incentive Award Plan [Member] 2021 Incentive Award Plan. Entity Address Address Line1 Entity Address, Address Line One 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] Fair value contingent consideration measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Expected Stock Price Volatility Measurement Input, Price Volatility [Member] Restricted Cash Restricted Cash, Total Standby letters of credit Restricted Cash Subsequent Event Type [Domain] Restricted cash and cash equivalents, noncurrent, nature of restriction, description Restricted Cash and Cash Equivalents, Noncurrent, Nature of Restriction, Description Fees incurred related to issuance of common stock from at the market offering Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Issuance of common stock, net of offering costs Risk free interest rate, minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Income Statement Location Income Statement Location [Axis] Variable lease cost Variable Lease, Cost Cobalt Biomedicine, Inc Cobalt Biomedicine Inc [Member] Cobalt Biomedicine, Inc. Risk free interest rate, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Expected dividend Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate 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] Expense in connection with change in estimated fair value of success payment liability Change in estimated fair value of success payment Gain Expense In Connection With Change In Estimated Fair Value Of Success Payment Liabilities Gain expense in connection with change in estimated fair value of success payment liabilities. Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] Vesting of restricted stock (in shares) 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] Estimated fair value of contingent consideration, short term liabilities Contingent consideration Business Combination, Contingent Consideration, Liability, Current Title of 12(b) Security Title of 12(b) Security Percentage allowed for eligible employees to purchase shares of common stock Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Employee Subscription Rate INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Success payment liabilities Success Payment Liabilities Noncurrent Success payment liabilities noncurrent. Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Subsequent Event [Table] Contingent Consideration by Type Contingent Consideration by Type [Axis] Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest [Abstract] Matching contribution by employer under retirement and savings plan Defined Contribution Plan, Employer Discretionary Contribution Amount Cash-based expenses related to employee severance, benefits and related costs Deferred Compensation Cash-Based Arrangements, Liability, Current and Noncurrent Goodwill and Intangible Asset Impairment, Total Business acquisition, impairment of intangible assets or goodwill Goodwill and Intangible Asset Impairment Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss, Total Total unrealized losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Weighted-Average Remaining Contractual Life (years), Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Common stock, shares outstanding Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Stock-based compensation Share-Based Payment Arrangement [Text Block] Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 2028 and thereafter Lessee Operating Lease Liability Payments Due Year Five And Thereafter Lessee operating lease liability payments due year five and thereafter. Lease arrangement, contractual expiration period, beginning year Operating Lease Expiration Beginning Month And Year Operating lease expiration beginning month and year. Payment to collaborators Payment To Collaborators Payment to collaborators. Percentage related to employees able to purchase shares at lower of fair market value Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date Number of standby letters of credit Number Of Standby Letters Of Credit Number of standby letter of credit. Income Statement Location Income Statement Location [Domain] Weighted-Average Exercise Price per Share, Granted Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Document Type Document Type Proceeds from issuance of common stock gross. Proceeds From Issuance Of Common Stock Gross Gross proceeds from issuance of common stock Market Capitalization Equal to or exceeds $7.4 billion, but less than $8.1 billion Market Capitalization Two [Member] Market capitalization two. Fair Value by Liability Class Fair Value by Liability Class [Domain] Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Document Quarterly Report Document Quarterly Report Reimbursement of tenant improvements Reimbursement Of Tenant Improvements Reimbursement of tenant improvements. Marketable Securities, Noncurrent Long-term marketable securities Counterparty Name Counterparty Name [Domain] Cobalt Success Payment Potential Success Payment Potential success payment. Net income (loss) attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic 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 Entity Filer Category Entity Filer Category Balance Sheet Location Balance Sheet Location [Domain] Purchases of marketable securities Payments to Acquire Marketable Securities Asset Class Asset Class [Axis] Purchases of property and equipment included in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Total liabilities Liabilities Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Cambridge, MA MASSACHUSETTS Total stockholders' equity Beginning balance Ending balance Equity, Attributable to Parent Research and development related success payments and contingent consideration Research And Development Related Success Payments And Contingent Consideration Changes in estimated fair value of success payment liabilities and contingent consideration recorded in research and development expenses. Consolidated Entities Consolidated Entities [Axis] Intangible Assets, Net (Excluding Goodwill), Total Intangible asset Intangible Assets, Net (Excluding Goodwill) Construction in progress costs write-off Construction In Progress Costs Write Off Construction in progress costs write-off. Net income (loss) Net income (loss) Net income (loss) Net Income (Loss) At The Market Offering At The Market Offering At The Market Facility [Member] At-the-market facility. Seattle, WA WASHINGTON Corporate Debt Securities Corporate Debt Securities [Member] Statement of Financial Position [Abstract] Weighted-average number of common shares - diluted Weighted-average number of common shares - diluted Weighted Average Number of Shares Outstanding, Diluted Success payment(s) Potential Success Payments Potential success payments. Non-cash expense for operating lease right-of-use assets Operating Lease, Right-of-Use Asset, Periodic Reduction Share issue price Shares Issued, Price Per Share Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Weighted-average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Use of estimates Use of Estimates, Policy [Policy Text Block] Income Taxes Income Tax Disclosure [Text Block] Weighted-Average Exercise Price per Share Outstanding, Beginning Balance Weighted-Average Exercise Price per Share Outstanding, Ending Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Summary of Calculation of Basic and Diluted Net Income (Loss) Per Share of Common Stock Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Leasehold Improvements Leasehold Improvements [Member] Unrealized losses 12 months or greater Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 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] Measurement Frequency Measurement Frequency [Domain] Long-term Liabilities Other Noncurrent Liabilities [Member] Payments to Acquire Property, Plant, and Equipment, Total Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Commencement Dates, Beginning Operating Lease Commencement Beginning Month And Year Operating lease commencement beginning month and year. Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Stock Issued During Period, Shares, New Issues Aggregate common stock sold Issuance of common stock, net of offering costs (in shares) Total accrued compensation Accrued compensation Employee-related Liabilities, Current Remeasurement of operating lease right-of-use asset for lease modification Remeasurement Of Operating Lease Right Of Use Asset For Lease Modifications Remeasurement of operating lease right-of-use asset for lease modifications. Business Acquisition Business Acquisition [Axis] Proceeds from maturities of marketable securities Proceeds from Sale and Maturity of Marketable Securities Income Tax Disclosure [Abstract] Accrued expenses and other current liabilities: Accrued Liabilities and Other Liabilities [Abstract]