Summary of significant accounting policies - Restricted cash (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Summary of significant accounting policies
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