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Summary of significant accounting policies (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Accounts Receivable          
Allowance for doubtful accounts $ 0.0   $ 0.0   $ 0.0
Variable Interest Entities          
Number of entities in which variable interest held | item 0   0    
Percentage of MediCare Part D Insurance Coverage Gap Required to be Funded by Manufacturers     70.00%    
Medicare Part D Insurance Coverage Gap, Increase in Eligible Patient Spending, Percentage       30.00%  
Advertising Expenses          
Advertising expenses $ 7.5 $ 5.3 $ 18.3 $ 10.1  
MorphoSys AG          
Variable Interest Entities          
Collaboration Agreement Profit Loss Sharing Ratio     50.00% 50.00%  
JAKAFI          
Inventory          
Shelf life for finished goods inventory, maximum     36 months    
ICLUSIG          
Inventory          
Shelf life for finished goods inventory, maximum     36 months    
Variable Interest Entities          
Amortization period     12 years 6 months    
PEMAZYRE          
Inventory          
Period of lower average per unit cost of materials     33 months    
Shelf life for finished goods inventory, maximum     36 months