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Liability related to sales of future royalties and sales milestones, net - Schedule of Liability Related to Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Liability, Future Revenue [Roll Forward] |  |  |  |  |
Interest expense accrued on liability related to future royalties and sales milestones, net | $ 5,000 | $ 1,800 | $ 14,878 | $ 5,427 |
Blackstone Collaboration Agreement |  |  |  |  |
Liability, Future Revenue [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 125,900 | $ 47,016 | $ 47,016
Proceeds from Blackstone Development Payments received |  |  |  |  | 70,000
Interest expense accrued on liability related to future royalties and sales milestones, net |  |  | 14,878 |  | 8,005
Cumulative catch-up adjustment |  |  |  |  | 879
Ending Balance | $ 140,778 |  | $ 140,778 |  | $ 125,900

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- Definition Collaboration Agreement, Cumulative Catch-Up Adjustment + References No definition available. + Details
Name: | autl_CollaborationAgreementCumulativeCatchUpAdjustment
Namespace Prefix: | autl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Collaboration Agreement, Non-Cash Interest Expense + References No definition available. + Details
Name: | autl_CollaborationAgreementNonCashInterestExpense
Namespace Prefix: | autl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaborative Agreement, Liability, Additions + References No definition available. + Details
Name: | autl_CollaborativeAgreementLiabilityAdditions
Namespace Prefix: | autl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Collaborative Agreements, Debt Liability + References No definition available. + Details
Name: | autl_CollaborativeAgreementsDebtLiability
Namespace Prefix: | autl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liability, Future Revenue, Rollforward + References No definition available. + Details
Name: | autl_LiabilityFutureRevenueRollforwardRollForward
Namespace Prefix: | autl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=autl_BlackstoneCollaborationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |