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Information [Line Items] Document Information [Line Items] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Proceeds from the exercise of share options Proceeds from Stock Options Exercised Leased assets terminated and obtained in exchange for operating lease liabilities, net Right-of-Use Assets Terminated and Obtained in Exchange for Operating Lease Liability, Net Right-of-Use Assets Terminated and Obtained in Exchange for Operating Lease Liability, Net Loss on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Collaborative agreement, sale of stock prohibited without registrant's approval, period (in months) Collaborative Agreement, Sale of Stock Prohibited Without Registrant's Approval, Period Collaborative Agreement, Sale of Stock Prohibited Without Registrant's Approval, Period Variable costs Variable Lease, Cost, Net Of Reversal Variable Lease, Cost, Net Of Reversal Forfeited weighted average exercise price (usd per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Prepaid expenses and other current assets Total prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Insider Trading Arrangements [Line Items] Prepaid Expenses and Other Current Assets Other Current Assets [Text Block] Related Party [Axis] Related Party, Type [Axis] Options outstanding, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Non-cash interest expense, catch-up Collaboration Agreement, Non-Cash Interest Expense, Including Cumulative Catch-Up Adjustment Collaboration Agreement, Non-Cash Interest Expense, Including Cumulative Catch-Up Adjustment Share-based compensation net of amounts capitalized Employee Benefit and Share-Based Payment Arrangement, Noncash Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Lease Contractual Term [Axis] Lease Contractual Term [Axis] Research and development costs Accrued Research And Development Cost, Current Accrued Research And Development Cost, Current Document Period End Date Document Period End Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Adoption Date Trading Arrangement Adoption Date Less: 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Terminated [Flag] Numerator Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Income tax benefit Income Tax Expense (Benefit) Variable consideration amount, agreement inception Revenue, Remaining Performance Obligation, Variable Consideration Amount, Agreement Inception Revenue, Remaining Performance Obligation, Variable Consideration Amount, Agreement Inception Compensation and benefits Employee-related Liabilities, Current Fair value measurements Fair Value Disclosures [Text Block] Revenue Benchmark Revenue Benchmark [Member] Name Trading Arrangement, Individual Name Contract with customer, liability gross Contract With Customer, Liability, Gross Contract With Customer, Liability, Gross Sublease, Lease Term 2 Sublease, Lease Term 2 [Member] Sublease, Lease Term 2 Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] Equity [Abstract] Equity [Abstract] Weighted-average remaining lease term - operating leases Operating Lease, Weighted Average Remaining Lease Term Other receivables Other Receivables, Net, Current Total license revenue Revenue from contract with customer Revenue from Contract with Customer, Excluding Assessed Tax Entity [Domain] Entity [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Amendment Flag Amendment Flag Cumulative catch-up adjustment arising from the liabilities related to future royalties and milestones, net (refer to Note 12) Collaboration Agreement, Cumulative Catch-Up Adjustment Collaboration Agreement, Cumulative Catch-Up Adjustment Investor Investor [Member] 2026 Lessor, Operating Lease, Payment to be Received, Year Two Legal Entity [Axis] Legal Entity [Axis] Money market funds Money Market Funds [Member] Autolus Autolus [Member] Autolus Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Capitalized implementation costs included in accrued expenses Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization, Current and Noncurrent Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization, Current and Noncurrent Deferred income tax Increase (Decrease) in Deferred Income Taxes Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Vesting of restricted stock unit awards net of shares withheld to cover tax withholding (in shares) Stock Vested During Period, Shares, Restricted Stock Stock Vested During Period, Shares, Restricted Stock Weighted-average discount rate — operating leases (percent) Operating Lease, Weighted Average Discount Rate, Percent Accrued interest income Accrued Interest Income, Current Accrued Interest Income, Current Interest expense accrued on liabilities related to future royalties and milestones, net (refer to Note 12) Interest expense accrued 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Selected Measure Amount Additional Paid in Capital Additional Paid-in Capital [Member] Expired weighted average exercise price (usd per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Cover [Abstract] Lab equipment Equipment [Member] Allocated consideration based on relative fair value Related Party Transaction, Amounts Of Transaction, Allocated Based On Relative Fair Value Related Party Transaction, Amounts Of Transaction, Allocated Based On Relative Fair Value Subsequent Events Subsequent Events [Text Block] Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition United States UNITED STATES Number of manufacturing properties Lessor, Operating Lease, Number Of Manufacturing Properties Lessor, Operating Lease, Number Of Manufacturing Properties Other long-term payables Other Liabilities, Noncurrent Vested weighted average grant date fair value (usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Non-NEOs Non-NEOs [Member] Total lease payments Lessee, Operating Lease, Liability, to be Paid Strategic Collaboration and Financing Agreement Strategic Collaboration And Financing Agreement [Member] Strategic Collaboration And Financing Agreement Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Capitalized share-based compensation, net of forfeitures Capitalized Share-based Compensation Capitalized Share-based Compensation Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted-average basic ordinary shares (in shares) Weighted-average number of ordinary shares used in net loss per share - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Total operating expenses, net Operating Income (Loss) Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Office equipment Office Equipment [Member] Product Information [Line Items] Product Information [Line Items] Other comprehensive income (loss): Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] David Brochu [Member] David Brochu Related Party Transaction [Axis] Related Party Transaction [Axis] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Statement Statement [Line Items] Estimate of Fair Value Measurement Estimate of Fair Value Measurement [Member] Vested and expected to vest (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Underwriters public offering Public Stock Offering [Member] Public Stock Offering [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Subsequent ADSs, representing ordinary shares Subsequent ADSs, Representing Ordinary Shares [Member] Subsequent ADSs, Representing Ordinary Shares