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Accrued Expenses and Other Liabilities - Narratives (Details) $ in Millions	Dec. 31, 2019 USD ($)
Payables and Accruals [Abstract]
Current portion of long term debt and leases	$ 0.3

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- Definition

Long-term Debt, Current Maturities And Lease Incentive Liability, Current

+ References

No definition available.

+ Details

Name:	autl_LongtermDebtCurrentMaturitiesAndLeaseIncentiveLiabilityCurrent
Namespace Prefix:	autl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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