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Summary of significant accounting policies - Liability for Sale of Future Royalties (Details) - USD ($)
$ in Thousands
9 Months Ended
Jul. 17, 2020
Sep. 30, 2020
Sep. 30, 2021
Assigned royalty payments      
Cash consideration received from Royalty Purchase Agreement $ 650,000 $ 650,000  
Assigned royalty payment, retained percentage 57.067%    
Remaining potential milestones that can be achieved     $ 325,000
Royalty Purchase Agreement | Assigned Royalty Payments      
Assigned royalty payments      
Assigned royalty payment, percentage 42.933%    
Cash consideration received from Royalty Purchase Agreement $ 650,000    
Royalty purchase agreement, termination period 60 days    
Royalty purchase agreement, payment maximum $ 1,300,000