Revenue - Schedule of Current Accruals for Rebates and Chargebacks (Details) $ in Thousands	6 Months Ended
Jun. 30, 2026 USD ($)
Customer Refund Liability, Current and Non-current [Roll Forward]
As of December 31, 2025	$ 4,991
Rebate and chargeback accruals related to product revenue recognized in the period	9,659
Payments and credits made	(4,610)
Adjustments related to prior period sales	(847)
As of June 30, 2026	9,193
Rebates
Customer Refund Liability, Current and Non-current [Roll Forward]
As of December 31, 2025	3,658
Rebate and chargeback accruals related to product revenue recognized in the period	6,711
Payments and credits made	(1,995)
Adjustments related to prior period sales	0
As of June 30, 2026	8,374
Chargebacks
Customer Refund Liability, Current and Non-current [Roll Forward]
As of December 31, 2025	1,333
Rebate and chargeback accruals related to product revenue recognized in the period	2,948
Payments and credits made	(2,615)
Adjustments related to prior period sales	(847)
As of June 30, 2026	$ 819

Contract with Customer, Refund Liability, Adjustments Related to Prior Period Sales

No definition available.

Name:	autl_ContractWithCustomerRefundLiabilityAdjustmentsRelatedToPriorPeriodSales
Namespace Prefix:	autl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Contract with Customer, Refund Liability, Payments And Credits

+ References

No definition available.

+ Details

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

- Definition

Customer Refund Liability, Current and Non-current

+ References

No definition available.

+ Details

Name:	autl_CustomerRefundLiabilityCurrentAndNonCurrentRollForward
Namespace Prefix:	autl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase (Decrease) In Contract With Customer, Refund Liability, Sales

+ References

No definition available.

+ Details

Name:	autl_IncreaseDecreaseInContractWithCustomerRefundLiabilitySales
Namespace Prefix:	autl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 27
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-27

+ Details

Name:	us-gaap_ContractWithCustomerRefundLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_ProductOrServiceAxis=autl_RebatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=autl_ChargebackMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: