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Share-based compensation - RSU activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
2014 Plan      
Other disclosure      
Vesting period (in years) 4 years    
2014 Plan | Non-executive directors      
Other disclosure      
Vesting period (in years) 1 year    
Restricted share units ("RSUs")      
Number of shares      
Non-vested at beginning of period (in shares) 710,617    
Granted (in shares) 1,604,533    
Vested (in shares) (292,688)    
Forfeited (in shares) (203,688)    
Non-vested at end of period (in shares) 1,818,774 710,617  
Weighted average grant-date fair value      
Non-vested at beginning of period (in dollars per share) $ 38.89    
Granted (in dollars per share) 16.10    
Vested (in dollars per share) 39.31    
Forfeited (in dollars per share) 23.39    
Non-vested at end of period (in dollars per share) $ 20.46 $ 38.89  
Other disclosure      
Total weighted average grant date fair value of RSUs granted during the period (in millions) $ 25,800    
Restricted share units ("RSUs") | Non-executive directors      
Other disclosure      
Vesting period (in years) 1 year    
Restricted share units ("RSUs") | Directors and Officers      
Number of shares      
Granted (in shares) 380,288    
Weighted average grant-date fair value      
Granted (in dollars per share) $ 6.0    
Restricted share units ("RSUs") | 2014 Plan      
Number of shares      
Granted (in shares) 1,604,533 574,921 376,799
Weighted average grant-date fair value      
Granted (in dollars per share) $ 16.10 $ 36.14 $ 48.18
Other disclosure      
Total weighted average grant date fair value of RSUs granted during the period (in millions) $ 5,104 $ 8,063 $ 12,156
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    
Minimum | Restricted share units ("RSUs")      
Other disclosure      
Vesting period (in years) 1 year    
Maximum | Restricted share units ("RSUs")      
Other disclosure      
Vesting period (in years) 3 years