Accrued Expenses and Other Liabilities - Narratives (Details) $ in Millions	Jun. 30, 2021 USD ($)
Payables and Accruals [Abstract]
Research and development costs, decrease	$ 4.0

Research and Development Costs, Decrease In Accruals

No definition available.

Name:	autl_ResearchAndDevelopmentCostsDecreaseInAccruals
Namespace Prefix:	autl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant