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Summary of Significant Accounting Policies - Recent Accounting Pronouncements Adopted (Details) $ in Millions	Mar. 31, 2020 USD ($)
Accounting Policies [Abstract]
Deferred implementation cost, current	$ 0.2
Deferred implementation cost, non-current	$ 0.6

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- Definition

Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization, Current

+ References

No definition available.

+ Details

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

X

- Definition

Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization, Non-current

+ References

No definition available.

+ Details

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

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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