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Commitments and contingencies (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jul. 10, 2020
ft²
Feb. 29, 2020
USD ($)
Commitments and contingencies        
Initial lease term under the agreement 1 year      
Lease agreement term       7 years
Square feet of office | ft²     6,647  
Minimum payments during the term       $ 2,300
Non-cancelable purchase commitments with contract research organizations and contract manufacturing organizations $ 11,123      
Total lease liability $ 1,564      
Operating Lease, Liability, Statement of Financial Position [Extensible List] akro:AccruedExpensesAndOtherCurrentLiabilities us-gaap:OperatingLeaseLiabilityNoncurrent      
Operating lease liability, noncurrent $ 1,365 $ 1,516    
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating lease liability, noncurrent      
Short-term Liabilities $ 199      
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued Expenses and Other Current Liabilities.