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Share-based compensation - Service based options activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Unrecognized compensation expense      
Award expiration period 10 years    
Employee Stock Option, Service-Based      
Options (in shares)      
Outstanding, beginning balance (in shares) 1,643,266    
Shares granted (in shares) 0 0 0
Exercised (in shares) (427,444)    
Forfeitures (in shares) 0    
Outstanding, ending balance (in shares) 1,215,822 1,643,266  
Options, exercisable (in shares) 1,162,656    
Vested or expected to vest (in shares) 1,215,822    
Weighted- Average Exercise Price      
Outstanding, beginning balance (in dollars per share) $ 5.68    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 5.62    
Forfeitures (in dollars per share) 0    
Outstanding, ending balance (in dollars per share) 5.70 $ 5.68  
Options, exercisable (in dollars per share) 5.58    
Vested or expected to vest (in dollars per share) $ 5.70    
Weighted- Average Remaining Contractual Term (Years)      
Remaining term, options outstanding 5 years 1 month 6 days 6 years 1 month 6 days  
Remaining term, options exercisable 5 years    
Remaining term, options vested or expected to vest 5 years 1 month 6 days    
Aggregate Intrinsic Value (in thousands)      
Options outstanding, beginning $ 53,129,000    
Options outstanding, ending 18,968,000 $ 53,129,000  
Options exercisable 18,272,000    
Options vested or expected to vest $ 18,968,000    
Unrecognized compensation expense      
Vesting period 4 years    
Award expiration period 10 years    
Options exercised (in shares) $ 11,200,000 54,700,000 $ 13,900,000
Total fair value, options vested in period 700,000 $ 2,600,000 $ 2,600,000
Unrecognized compensation expense $ 300,000    
Weighted average period over which unrecognized compensation expense would be recognized 10 months 24 days    
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%    
Employee Stock Option, Target-Based      
Options (in shares)      
Outstanding, beginning balance (in shares) 3,687,664    
Shares granted (in shares) 0 0 0
Exercised (in shares) (414,744) 0 0
Forfeitures (in shares) 0    
Outstanding, ending balance (in shares) 3,272,920 3,687,664  
Options, exercisable (in shares) 3,272,920    
Vested or expected to vest (in shares) 3,272,920    
Weighted- Average Exercise Price      
Outstanding, beginning balance (in dollars per share) $ 6.75    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 6.75    
Forfeitures (in dollars per share) 0    
Outstanding, ending balance (in dollars per share) 6.75 $ 6.75  
Options, exercisable (in dollars per share) 6.75    
Vested or expected to vest (in dollars per share) $ 6.75    
Weighted- Average Remaining Contractual Term (Years)      
Remaining term, options outstanding 5 years 9 months 18 days 6 years 9 months 18 days  
Remaining term, options exercisable 5 years 9 months 18 days    
Remaining term, options vested or expected to vest 5 years 9 months 18 days    
Aggregate Intrinsic Value (in thousands)      
Options outstanding, beginning $ 115,278,000    
Options outstanding, ending 47,623,000 $ 115,278,000  
Options exercisable 47,623,000    
Options vested or expected to vest 47,623,000    
Unrecognized compensation expense      
Options exercised (in shares) 7,900,000    
Total fair value, options vested in period 33,000,000    
Unrecognized compensation expense $ 0