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Stock award plan - Share-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Stock option plan        
Share-based compensation expense $ 26,942 $ 28,670 $ 85,128 $ 82,989
Unrecognized compensation cost 179,300   $ 179,300  
Weighted average remaining service period for recognition of unrecognized compensation cost     1 year 10 months 24 days  
Research and development        
Stock option plan        
Share-based compensation expense 13,986 15,063 $ 44,828 41,896
Selling, general and administrative        
Stock option plan        
Share-based compensation expense $ 12,956 $ 13,607 $ 40,300 $ 41,093