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Summary of Significant Accounting Policies - Research and Development (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Accounting Policies [Abstract] |  |  |  |
Research and development tax credits | $ 37 | $ 200 | $ 200 | $ 200

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- Definition Research and Development Tax Credits + References No definition available. + Details
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Namespace Prefix: | autl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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