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Prepaid Expenses and Other Assets, Current - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Decrease to prepaid facility and manufacturing	$ (2.7)

X

- Definition

Increase (Decrease) To Prepaid Facility And Manufacturing

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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