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Income taxes - Current income tax provision (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Current income tax provision: |  |
Income tax benefit related to operating losses and research and development tax credits | $ 0 | $ 0

X
- Definition Amount of current income tax expense (benefit) directly related to operating loss carryforwards and certain tax credits. + References No definition available. + Details
Name: | akro_IncomeTaxExpenseBenefitRelatedToOperatingLossesAndCredits
Namespace Prefix: | akro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration