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Summary of significant accounting policies - Restricted cash (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Summary of significant accounting policies
Separate cash balance for the landlord	$ 108	$ 108
Separate cash balance to collateralize corporate credit cards with a bank		$ 40

X

- Definition

Amount of cash restricted as to collateralize corporate credit cards with a bank, classified as noncurrent.

+ References

No definition available.

+ Details

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

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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