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Share-based compensation - Service based options activity (Details) - Service-based options
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Options (in shares)    
Outstanding Beginning Balance | shares 4,073,286  
Granted | shares 0  
Exercised | shares (33,792)  
Outstanding Ending Balance | shares 4,039,494 4,073,286
Exercisable | shares 2,400,693  
Vested or expected to vest | shares 4,039,494  
Weighted Average Exercise Price    
Outstanding Beginning Balance | $ / shares $ 5.65  
Exercised | $ / shares 5.49  
Outstanding Ending Balance | $ / shares 5.65 $ 5.65
Exercisable | $ / shares 5.50  
Vested or expected to vest | $ / shares $ 5.65  
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value    
Remaining term, options outstanding 7 years 3 months 18 days 8 years 1 month 6 days
Remaining term, options exercisable 7 years 2 months 12 days  
Remaining term, options vested or expected to vest 7 years 3 months 18 days  
Aggregate intrinsic value, options outstanding, beginning | $ $ 37,520  
Aggregate intrinsic value, options exercised | $ 498  
Aggregate intrinsic value, options outstanding, ending | $ 129,098 $ 37,520
Aggregate intrinsic value, options exercisable | $ 77,080  
Aggregate intrinsic value, options vested or expected to vest | $ 129,098  
Total fair value, options vested in period | $ $ 1,100