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Summary of significant accounting policies - Restricted cash (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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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

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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