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Share-based compensation - Service based options activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unrecognized compensation expense        
Award expiration period 10 years      
Employee Stock Option, Service-Based        
Options (in shares)        
Outstanding, beginning balance (in shares) 3,546,826 4,073,286 4,245,709  
Shares granted (in shares) 0 0 212,668  
Exercised (in shares) (1,903,560) (526,460) (168,391)  
Forfeitures (in shares) 0 0 (216,700)  
Outstanding, ending balance (in shares) 1,643,266 3,546,826 4,073,286 4,245,709
Exercisable (in shares) 1,434,887      
Vested or expected to vest (in shares) 1,643,266      
Weighted- Average Exercise Price        
Outstanding, beginning balance (in dollars per share) $ 5.65 $ 5.65 $ 5.51  
Granted (in dollars per share) 0 0 8.21  
Exercised (in dollars per share) 5.62 5.67 5.49  
Forfeitures (in dollars per share) 0 0 5.49  
Outstanding, ending balance (in dollars per share) 5.68 $ 5.65 $ 5.65 $ 5.51
Exercisable (in dollars per share) 5.49      
Vested or expected to vest (in dollars per share) $ 5.68      
Weighted- Average Remaining Contractual Term (Years)        
Remaining term, options outstanding 6 years 1 month 6 days 7 years 1 month 6 days 8 years 1 month 6 days 8 years 10 months 24 days
Remaining term, options exercisable 5 years 10 months 24 days      
Remaining term, options vested or expected to vest 6 years 1 month 6 days      
Aggregate Intrinsic Value (in thousands)        
Options outstanding, beginning $ 86,098 $ 37,520 $ 0  
Options exercised 54,716 13,899 256  
Options outstanding, ending 53,129 86,098 37,520 $ 0
Options exercisable 46,658      
Options vested or expected to vest 53,129      
Total fair value, options vested in period 2,600 $ 2,600 $ 2,400  
Unrecognized compensation expense        
Unrecognized compensation expense $ 1,000      
Vesting period 4 years      
Weighted average period over which unrecognized compensation expense would be recognized 1 year 7 months 6 days      
Award expiration period 10 years      
Employee Stock Option, Service-Based | Tranche One        
Unrecognized compensation expense        
Vesting period 1 year      
Percentage that vest 25.00%      
Employee Stock Option, Service-Based | Tranche Two        
Unrecognized compensation expense        
Vesting period 1 year      
Percentage that vest 25.00%      
Employee Stock Option, Service-Based | Tranche Three        
Unrecognized compensation expense        
Vesting period 1 year      
Percentage that vest 25.00%      
Employee Stock Option, Service-Based | Tranche Four        
Unrecognized compensation expense        
Vesting period 1 year      
Percentage that vest 25.00%