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Share-Based Compensation - Share Based Compensation Allocation Narratives (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	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

Name:	autl_ShareBasedPaymentArrangementExpenseIncreaseDecrease
Namespace Prefix:	autl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration