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Shares Available Under 2017 Plan [Member] 2018 Equity Incentive Plan - Shares Available Under 2017 Plan [Member] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Interest expense accrued on liabilities related to future royalties and milestones, net Collaboration Agreement, Non-Cash Interest Expense And Cumulative Catch-Up Adjustment Collaboration Agreement, Non-Cash Interest Expense And Cumulative Catch-Up Adjustment Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Total other income (expenses), net Nonoperating Income (Expense) Upfront license payment Collaborative Arrangement, Rights And Obligations, Annual License Fee Collaborative Arrangement, Rights And Obligations, Annual License Fee Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Interest Expense, Net Interest Income and Interest Expense Disclosure [Table Text Block] Assets under construction Asset under Construction [Member] Non-current portion of liabilities related to future royalties and milestones, net Collaborative Agreements, Debt Liability, Non-Current Collaborative Agreements, Debt Liability, Non-Current Manufacturing Space in Enfield, United Kingdom Manufacturing Space In Enfield, United Kingdom [Member] Manufacturing Space In Enfield, United Kingdom [Member] Award Timing Disclosures [Line Items] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] License Agreements License Agreements [Text Block] License Agreements [Text Block] Shareholders’ Equity Equity [Text Block] Net loss Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Collaboration agreement, non-cash interest expense including cumulative catch-up adjustment Collaboration Agreement, Non-Cash Interest Expense, Including Cumulative Catch-Up Adjustment Collaboration Agreement, Non-Cash Interest Expense, Including Cumulative Catch-Up Adjustment Non-current liabilities: Liabilities, Noncurrent [Abstract] State and local Deferred Foreign State and Local Income Tax Expense (Benefit) Deferred Foreign State and Local Income Tax Expense (Benefit) Other accrued expenditure Other Accrued Liabilities, Current Schedule of Reconciliation of Income Tax Expense Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Vesting period (years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Liability, Future Revenue, Rollforward [Abstract] Liability, Future Revenue, Rollforward [Abstract] Liability, Future Revenue, Rollforward Prepaid Expenses and Other Current Assets Other Current Assets [Text Block] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Research and development accruals Accrued Research And Development Cost, Current Accrued Research And Development Cost, Current Adoption Date Trading Arrangement Adoption Date BioNTech Liability BioNTech Liability [Member] BioNTech Liability Lease term Lessee, Operating Lease, Term of Contract Customer [Axis] Customer [Axis] Measurement Input, Expected Term Measurement Input, Expected Term [Member] Loss from operations Operating Income (Loss) Deferred B shares Deferred Class B Shares [Member] Deferred Class B Shares [Member] Contractual Maturity [Domain] Contractual Maturity [Domain] Contractual Maturity [Domain] Accumulated deficit Accumulated deficit Retained Earnings (Accumulated Deficit) Name of Property [Axis] Name of Property [Axis] Increase in reserved shares term (in years) Share-Based Compensation Arrangement By Share-Based Payment Award, Increase In Reserved Shares Term Share-Based Compensation Arrangement By Share-Based Payment Award, Increase In Reserved Shares Term Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Long-term supply agreement, firm commitment period Long-Term Supply Agreement, Firm-Commitment Period Long-Term Supply Agreement, Firm-Commitment Period Number of securities held Number of securities held in a continuous unrealized loss position Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Class of Stock [Axis] Class of Stock [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Payables and Accruals [Abstract] Payables and Accruals [Abstract] Other income, net Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Total deferred income tax benefit Deferred income tax benefit Deferred Income Tax Expense (Benefit) Adjustments to reconcile net loss to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Autolus Autolus [Member] Autolus Switzerland and Germany Foreign Tax Jurisdiction, Other [Member] Liabilities related to future royalties and milestones, net - non-current Contract with Customer, Liability Increase in deferred tax assets Increase (Decrease) In Deferred Tax Assets, Gross Increase (Decrease) In Deferred Tax Assets, Gross All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Per share price of issuance (usd per share) Sale of Stock, Price Per Share Shares authorized for distribution (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Interest expense accrued on liabilities related to future royalties and milestones, net (refer to Note 12) Collaborative Agreement, Non-Cash Interest Expense Collaborative Agreement, Non-Cash Interest Expense Cardinal Health 105, LLC (“Cardinal Health”) Cardinal Health 105, LLC (“Cardinal Health”) [Member] Cardinal Health 105, LLC (“Cardinal Health”) Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Raw materials Inventory, Raw Materials, Net of Reserves Weighted-average discount rate - operating leases (as a percent) Operating Lease, Weighted Average Discount Rate, Percent Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table 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 Inventory reserves and write-offs Inventory write-downs Inventory Write-down Total purchase price Warrants and Rights Outstanding Expected dividend yield Warrant Or Right Outstanding, Fair Value Assumption, Expected Dividend Rate Warrant Or Right Outstanding, Fair Value Assumption, Expected Dividend Rate Schedule of Basic and Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Exercisable (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Related Party Transaction [Domain] Related Party Transaction [Domain] Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Share-based compensation arrangement by share-based payment award, options, vested, number of shares (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares Other income (expense): Nonoperating Income (Expense) [Abstract] 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 Contractual Maturity [Axis] Contractual Maturity [Axis] Contractual Maturity MediaWorks Fifth Floor Including Laboratory Space MediaWorks Fifth Floor Including Laboratory Space [Member] MediaWorks Fifth Floor Including Laboratory Space Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in usd per share) Common stock, par value (usd/gbp per share) Common Stock, Par or Stated Value Per Share Conditional Payments [Axis] Conditional Payments [Axis] Conditional Payments [Axis] Granted (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Use of Estimates Use of Estimates, Policy [Policy Text Block] Schedule Of License Agreements [Table] Schedule Of License Agreements [Table] Schedule Of License Agreements [Table] Schedule of Financial Assets Measured at Fair Value on a Recurring Basis and Indicate the Level of the Fair Value Hierarchy Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Forfeited (usd per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Authorized grant, life (in years) Authorized Grant, Life Authorized Grant, Life Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Intellectual Property Intellectual Property [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Proceeds from maturities and redemptions of marketable securities: available-for-sale debt securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Periodical increase in authorized shares (percentage) Periodical Increase In Authorized Shares For Distribution Periodical Increase In Authorized Shares For Distribution Issuance of ordinary shares, net of issuance costs Stock Issued During Period, Value, New Issues Counterparty Name [Axis] Counterparty Name [Axis] Public Stock Offering Public Stock Offering [Member] Public Stock Offering [Member] Assets classified as marketable securities: available-for-sale debt securities Aggregate estimated fair value Debt Securities, Available-for-Sale Deferred Shares Deferred Shares [Member] Deferred Shares Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Upfront payment paid Royalty And Milestone Liability, Gross Royalty And Milestone Liability, Gross Corporate debt securities Corporate debt securities Corporate debt securities Corporate Debt Securities [Member] Subsequent ADSs, representing ordinary shares Subsequent ADSs, Representing Ordinary Shares [Member] Subsequent ADSs, Representing Ordinary Shares