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Stock award plan - Share-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Stock option plan    
Share-based compensation expense $ 28,815 $ 26,589
Unrecognized compensation cost $ 238,400  
Weighted average remaining service period for recognition of unrecognized compensation cost 2 years 4 months 20 days  
Research and development    
Stock option plan    
Share-based compensation expense $ 15,314 13,034
Selling, general and administrative    
Stock option plan    
Share-based compensation expense $ 13,501 $ 13,555