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Share-based compensation - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Target-based stock options    
Options    
Outstanding, beginning of period (in shares) 3,687,664  
Granted (in shares) 0  
Exercised (in shares) 0  
Forfeitures (in shares) 0  
Outstanding, end of period (in shares) 3,687,664 3,687,664
Options exercisable (in shares) 0  
Vested or expected to vest (in shares) 0  
Weighted‑ Average Exercise Price    
Outstanding, beginning of period (in dollars per share) $ 6.75  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 0  
Forfeitures (in dollars per share) 0  
Outstanding, end of period (in dollars per share) 6.75 $ 6.75
Options exercisable (in dollars per share) 0  
Vested or expected to vest (in dollars per share) $ 0  
Weighted‑ Average Remaining Contractual Term (Years)    
Remaining term, options outstanding 6 years 6 months 6 years 9 months 18 days
Aggregate Intrinsic Value (in thousands)    
Outstanding $ 103,477 $ 115,278
Exercised 0  
Options exercisable 0  
Vested or expected to vest $ 0  
Service-based stock option    
Options    
Outstanding, beginning of period (in shares) 1,643,266  
Granted (in shares) 0  
Exercised (in shares) (211,200)  
Forfeitures (in shares) 0  
Outstanding, end of period (in shares) 1,432,066 1,643,266
Options exercisable (in shares) 1,270,476  
Vested or expected to vest (in shares) 1,432,066  
Weighted‑ Average Exercise Price    
Outstanding, beginning of period (in dollars per share) $ 5.68  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 5.67  
Forfeitures (in dollars per share) 0  
Outstanding, end of period (in dollars per share) 5.68 $ 5.68
Options exercisable (in dollars per share) 5.50  
Vested or expected to vest (in dollars per share) $ 5.68  
Weighted‑ Average Remaining Contractual Term (Years)    
Remaining term, options outstanding 5 years 9 months 18 days 6 years 1 month 6 days
Remaining term, options exercisable 5 years 8 months 12 days  
Remaining term, options vested or expected to vest 5 years 9 months 18 days  
Aggregate Intrinsic Value (in thousands)    
Outstanding $ 41,716 $ 53,129
Exercised 6,725  
Options exercisable 37,244  
Vested or expected to vest $ 41,716