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Share-based compensation - Service Based Options Activity (Details) - Service-based stock option - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Options        
Outstanding, beginning of period (in shares)   3,546,826    
Granted (in shares)   0    
Exercised (in shares)   (1,257,440)    
Forfeitures (in shares)   0    
Outstanding, end of period (in shares) 2,289,386 2,289,386   3,546,826
Options exercisable (in shares) 1,524,788 1,524,788    
Vested or expected to vest (in shares) 2,289,386 2,289,386    
Weighted‑ Average Exercise Price        
Outstanding, beginning of period (in dollars per share)   $ 5.65    
Granted (in dollars per share)   0    
Exercised (in dollars per share)   5.62    
Forfeitures (in dollars per share)   0    
Outstanding, end of period (in dollars per share) $ 5.66 5.66   $ 5.65
Options exercisable (in dollars per share) 5.49 5.49    
Vested or expected to vest (in dollars per share) $ 5.66 $ 5.66    
Weighted‑ Average Remaining Contractual Term (Years)        
Remaining term, options outstanding   6 years 7 months 6 days 7 years 1 month 6 days  
Remaining term, options exercisable   6 years 4 months 24 days    
Remaining term, options vested or expected to vest   6 years 7 months 6 days    
Aggregate Intrinsic Value (in thousands)        
Outstanding $ 63,896 $ 63,896   $ 86,098
Exercised   36,219    
Options exercisable 42,813 42,813    
Vested or expected to vest 63,896 63,896    
Total fair value, options vested in period   1,300    
Unrecognized compensation expense $ 2,000 $ 2,000    
Weighted average period over which unrecognized compensation expense would be recognized 1 year 6 months