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Stock award plan - Share-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Stock option plan        
Share-based compensation expense $ 27,730 $ 25,699 $ 54,319 $ 51,406
Unrecognized compensation cost 227,400   $ 227,400  
Weighted average remaining service period for recognition of unrecognized compensation cost     2 years 5 months 19 days  
Research and development        
Stock option plan        
Share-based compensation expense 13,798 13,443 $ 26,832 27,168
Selling, general and administrative        
Stock option plan        
Share-based compensation expense $ 13,932 $ 12,256 $ 27,487 $ 24,238