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Stock-based compensation - Additional Information Related to RSAs and RSUs (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
RSAs and RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 3,093 $ 18,012 $ 13,181 $ 12,434
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of restricted stock released $ 3,387 $ 24,328 $ 12,448 $ 6,280