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Summary of Significant Accounting Policies - Recent Accounting Pronouncements Adopted (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($)
Accounting Policies [Abstract] |  |
Deferred implementation cost, current |  | $ 600
Deferred implementation cost, non-current | $ 1,000 | 1,000
Deferred implementation costs | $ 100 | $ 100

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- Definition Deferred Implementation Costs + References No definition available. + Details
Name: | autl_DeferredImplementationCosts
Namespace Prefix: | autl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization, Current + References No definition available. + Details
Name: | autl_HostingArrangementServiceContractImplementationCostCapitalizedafterAccumulatedAmortizationCurrent
Namespace Prefix: | autl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization, Non-current + References No definition available. + Details
Name: | autl_HostingArrangementServiceContractImplementationCostCapitalizedafterAccumulatedAmortizationNoncurrent
Namespace Prefix: | autl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration