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Stock award plan - Share-based compensation expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stock option plan      
Share-based compensation expense $ 101,636 $ 110,333 $ 103,513
Unrecognized compensation cost $ 119,600    
Weighted average remaining service period for recognition of unrecognized compensation cost 2 years 1 month 6 days    
Research and development      
Stock option plan      
Share-based compensation expense $ 52,941 55,869 53,632
Selling, general and administrative      
Stock option plan      
Share-based compensation expense $ 48,695 $ 54,464 $ 49,881