Summary of significant accounting policies - Restricted cash (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Separate cash balance for the landlord	$ 108	$ 108

Amount of cash restricted as to the benefit of the landlord in connection with the Company's office space lease in California (the "Lease"), classified as noncurrent.

No definition available.

Name:	akro_RestrictedCashNoncurrentLease
Namespace Prefix:	akro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant