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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jun. 30, 2018
Mar. 31, 2024
Mar. 31, 2023
Share-based compensation      
Authorized shares   14  
2014 Plan      
Share-based compensation      
Authorized shares   14  
Share-based compensation expense   $ 7,191 $ 8,061
Unrecognized compensation costs   $ 48,804  
Weighted-average remaining period for recognition (in years)   2 years 2 months 23 days  
2014 Plans and ESPP      
Share-based compensation      
Share-based compensation expense   $ 7,191 8,061
Research and development expenses | 2014 Plans and ESPP      
Share-based compensation      
Share-based compensation expense   3,425 4,305
Selling, general and administrative expense | 2014 Plans and ESPP      
Share-based compensation      
Share-based compensation expense   3,421 3,732
Cost of manufacturing services revenues | 2014 Plans and ESPP      
Share-based compensation      
Share-based compensation expense   345 24
Share options | 2014 Plan      
Share-based compensation      
Unrecognized compensation costs   $ 20,743  
Weighted-average remaining period for recognition (in years)   2 years 6 months 21 days  
Share options | 2014 Plans and ESPP      
Share-based compensation      
Share-based compensation expense   $ 2,913 3,274
Restricted share units ("RSUs") | 2014 Plan      
Share-based compensation      
Unrecognized compensation costs   $ 27,981  
Weighted-average remaining period for recognition (in years)   1 year 11 months 26 days  
Restricted share units ("RSUs") | 2014 Plans and ESPP      
Share-based compensation      
Share-based compensation expense   $ 4,370 4,630
Performance Share Awards | 2014 Plan      
Share-based compensation      
Unrecognized compensation costs   $ 80  
Weighted-average remaining period for recognition (in years)   7 months 9 days  
Performance Share Awards | 2014 Plans and ESPP      
Share-based compensation      
Share-based compensation expense   $ (99) $ 150
Employee share purchase plan | Employee share purchase plan (ESPP)      
Share-based compensation      
Ordinary shares available for issue 150,000 96,862 113,565
Discounted rate for purchase of shares 85.00%    
Employee share purchase plan | 2014 Plans and ESPP      
Share-based compensation      
Share-based compensation expense   $ 7 $ 7