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Stock award plan - Restricted Stock (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Number of Shares            
Share-based compensation expense     $ 18,543,000 $ 19,243,000 $ 36,603,000 $ 37,621,000
Unvested restricted stock units            
Number of Shares            
Balance at the beginning of the period (in shares)         3,527,575  
Granted (in shares)         1,576,245  
Vested (in shares)         (1,134,189)  
Forfeited (in shares)         (150,987)  
Balance at the end of the period (in shares) 3,527,575   3,818,644   3,818,644  
Weighted Average Grant Date Fair Value            
Balance at the beginning of the period (in dollars per share)         $ 33.39  
Granted (in dollars per share)         46.87  
Vested (in dollars per share)         37.01  
Forfeited (in dollars per share)         34.46  
Balance at the end of the period (in dollars per share) $ 33.39   $ 37.84   $ 37.84  
Performance-based restricted stock units (PSUs) - Stock price goals            
Number of Shares            
Share-based compensation expense     $ 300,000   $ 300,000  
Chief Executive Officer | Performance-based restricted stock units (PSUs)            
Number of Shares            
Share-based compensation expense         $ 0  
Chief Executive Officer | Performance-based restricted stock units (PSUs) - Development, regulatory or commercial goals            
Number of Shares            
Granted (in shares) 25,000 150,000        
Performance period 5 years 2 years        
Chief Executive Officer | Performance-based restricted stock units (PSUs) - Stock price goals            
Number of Shares            
Granted (in shares) 31,250