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Share-based compensation - Option Activity (Details)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Target-based stock options    
Options    
Outstanding, beginning of period (in shares) | shares 3,687,664  
Granted (in shares) | shares 0  
Exercised (in shares) | shares 0  
Forfeitures (in shares) | shares 0  
Outstanding, end of period (in shares) | shares 3,687,664 3,687,664
Options exercisable (in shares) | shares 0  
Vested or expected to vest (in shares) | shares 0  
Weighted‑ Average Exercise Price    
Outstanding, beginning of period (in dollars per share) | $ / shares $ 6.75  
Granted (in dollars per share) | $ / shares 0  
Exercised (in dollars per share) | $ / shares 0  
Forfeitures (in dollars per share) | $ / shares 0  
Outstanding, end of period (in dollars per share) | $ / shares 6.75 $ 6.75
Options exercisable (in dollars per share) | $ / shares 0  
Vested or expected to vest (in dollars per share) | $ / shares $ 0  
Weighted‑ Average Remaining Contractual Term (Years)    
Remaining term, options outstanding 7 years 7 years 9 months 18 days
Remaining term, options exercisable 0 years  
Remaining term, options vested or expected to vest 0 years  
Aggregate Intrinsic Value (in thousands)    
Outstanding | $ $ 117,158 $ 85,444
Exercised | $ 0  
Options exercisable | $ 0  
Vested or expected to vest | $ 0  
Unrecognized compensation expense    
Unrecognized compensation expense | $ $ 33,000  
Service-based stock option    
Options    
Outstanding, beginning of period (in shares) | shares 3,546,826  
Granted (in shares) | shares 0  
Exercised (in shares) | shares (1,526,856)  
Forfeitures (in shares) | shares 0  
Outstanding, end of period (in shares) | shares 2,019,970 3,546,826
Options exercisable (in shares) | shares 1,533,479  
Vested or expected to vest (in shares) | shares 2,019,970  
Weighted‑ Average Exercise Price    
Outstanding, beginning of period (in dollars per share) | $ / shares $ 5.65  
Granted (in dollars per share) | $ / shares 0  
Exercised (in dollars per share) | $ / shares 5.61  
Forfeitures (in dollars per share) | $ / shares 0  
Outstanding, end of period (in dollars per share) | $ / shares 5.67 $ 5.65
Options exercisable (in dollars per share) | $ / shares 5.50  
Vested or expected to vest (in dollars per share) | $ / shares $ 5.67  
Weighted‑ Average Remaining Contractual Term (Years)    
Remaining term, options outstanding 6 years 3 months 18 days 7 years 1 month 6 days
Remaining term, options exercisable 6 years 2 months 12 days  
Remaining term, options vested or expected to vest 6 years 3 months 18 days  
Aggregate Intrinsic Value (in thousands)    
Outstanding | $ $ 66,355 $ 86,098
Exercised | $ 44,082  
Options exercisable | $ 50,633  
Vested or expected to vest | $ 66,355  
Unrecognized compensation expense    
Unrecognized compensation expense | $ 1,400  
Total fair value, options vested in period | $ $ 2,000  
Weighted average period over which unrecognized compensation expense would be recognized 1 year 6 months