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Stock-based compensation - Classification of expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share-Based Compensation        
Stock-based compensation expense $ 6,992 $ 6,313 $ 14,186 $ 12,563
Stock options        
Share-Based Compensation        
Stock-based compensation expense 4,845 5,093 10,004 10,268
Restricted stock units        
Share-Based Compensation        
Stock-based compensation expense 2,147 1,220 4,182 2,295
Research and development        
Share-Based Compensation        
Stock-based compensation expense 2,529 2,227 5,143 4,685
Selling, general and administrative        
Share-Based Compensation        
Stock-based compensation expense $ 4,463 $ 4,086 $ 9,043 $ 7,878