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Summary of significant accounting policies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 17, 2020
Dec. 22, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Allowance for credit loss     $ 0   $ 0    
Inventory write-down       $ 0   $ 0  
Letters of Credit     7,500   $ 7,500    
Term for letter of credit (in years)         5 years    
Operating lease ROU assets     85,810   $ 85,810   $ 13,693
Allowance for doubtful accounts receivable     100   100   300
Federal income tax statutory rate   21.00%          
Deferred tax liability             $ 122,000
Cash consideration received from Royalty Purchase Agreement $ 650,000       650,000 $ 0  
State income tax provision     22,100   22,100    
Accounts receivable, allowance for credit loss,     0   0    
Fifth Anniversary              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Letters of Credit     $ 3,800   $ 3,800    
Royalty Purchase Agreement | Assigned Royalty Payments              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Cash consideration received from Royalty Purchase Agreement $ 650,000