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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	Sep. 30, 2018	Sep. 30, 2017
Accounting Policies [Abstract]
Research and development tax credits	$ 37	$ 200	$ 200

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- Definition

Research and Development Tax Credits

+ References

No definition available.

+ Details

Name:	autl_ResearchAndDevelopmentTaxCredits
Namespace Prefix:	autl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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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