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Share-based compensation - PSU activity (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2022
USD ($)
Milestone
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Other disclosure        
Service period 1 year 3 years    
Performance Share Awards        
Number of shares        
Non-vested at beginning of period (in shares) | shares   632,930    
Granted (in shares) | shares   34,700    
Vested (in shares) | shares   (213,145)    
Forfeited (in shares) | shares   (53,795)    
Non-vested at end of period (in shares) | shares   400,690 632,930  
Weighted average grant-date fair value        
Non-vested at beginning of period (in dollars per share)   $ 33.54    
Granted (in dollars per share)   15.11    
Vested (in dollars per share)   40.46    
Forfeited (in dollars per share)   29.35    
Non-vested at end of period (in dollars per share)   $ 28.82 $ 33.54  
Other disclosure        
Total weighted average grant date fair value of RSUs granted during the period (in millions) | $   $ 500    
Number of Milestones Achieved | Milestone   1    
Number of Defined Milestones | Milestone   5    
Number of Milestones Achievement Considered Probable | Milestone   1    
Performance Share Awards | 2014 Plan        
Number of shares        
Granted (in shares) | shares   34,700 555,600 91,003
Weighted average grant-date fair value        
Granted (in dollars per share)   $ 15.11 $ 30.19 $ 57.56
Other disclosure        
Total weighted average grant date fair value of RSUs granted during the period (in millions) | $   $ 4,450 $ 5,074 $ 21,852
Share options | 2014 Plan        
Weighted average grant-date fair value        
Granted (in dollars per share)   $ 9.04 $ 20.95 $ 28.08
Vested (in dollars per share)   $ 22.27