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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Share-based compensation              
Share-based compensation expense   $ 34,204 $ 25,635 $ 21,831      
Unrecognized compensation costs   $ 49,528          
Weighted-average remaining period for recognition (in years)   2 years 2 months 4 days          
2014 Plan              
Share-based compensation              
Increase in authorized shares     4,000,000   3,000,000 3,000,000 1,070,000
Authorized shares     12,601,471        
Employee share purchase plan (ESPP)              
Share-based compensation              
Share-based compensation expense   $ 26 $ 28 43      
Research and development expenses              
Share-based compensation              
Share-based compensation expense   18,402 12,834 11,995      
Selling, general and administrative expense              
Share-based compensation              
Share-based compensation expense   15,479 12,801 9,836      
Cost of manufacturing services revenues              
Share-based compensation              
Share-based compensation expense   323          
Share options              
Share-based compensation              
Share-based compensation expense   13,425 12,477 11,434      
Unrecognized compensation costs   $ 24,420          
Weighted-average remaining period for recognition (in years)   2 years 5 months 23 days          
Restricted share units ("RSUs")              
Share-based compensation              
Share-based compensation expense   $ 15,486 11,347 7,364      
Unrecognized compensation costs   $ 24,924          
Weighted-average remaining period for recognition (in years)   1 year 10 months 24 days          
Performance Share Awards              
Share-based compensation              
Share-based compensation expense   $ 5,267 $ 1,783 $ 2,990      
Unrecognized compensation costs   $ 184          
Weighted-average remaining period for recognition (in years)   1 month 20 days          
Employee Stock | Employee share purchase plan (ESPP)              
Share-based compensation              
Ordinary shares available for issue 150,000 116,060          
Discounted rate for purchase of shares 85.00%