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v3.21.2

Share-Based Compensation - Share Based Compensation Allocation Narratives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |  |
Share-based payment arrangement, expense, decrease | $ 2.7 | $ 13.7

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- Definition Share-based Payment Arrangement, Expense, Increase (Decrease) + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration