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Summary of significant accounting policies - Narrative (Details) - USD ($)
$ in Thousands
11 Months Ended
Dec. 31, 2019
Jun. 30, 2020
Jan. 31, 2019
Jan. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable $ 541 $ 464 $ 6,120 $ 3,899
Research and development tax credit receivable $ 5,084 $ 8,872 $ 8,305 $ 6,598
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting period 3 years      
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting period 4 years      
Sarepta | Accounts receivable | Customer concentration risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable $ 500