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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 | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Liability, Future Revenue, Rollforward [Abstract] |  |
Non-cash interest expense on liability related to sale of future royalties and sales milestones | $ 5,427 | $ 0
Blackstone Collaboration Agreement |  |
Liability, Future Revenue, Rollforward [Abstract] |  |
Balance as of December 31, 2021 | 47,016 |
Non-cash interest expense on liability related to sale of future royalties and sales milestones | 5,427 |
Balance as of September 30, 2022 | $ 52,443 |

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