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Stock-based compensation - Summary of Service-based Stock Option Activity and Related Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Weighted-average exercise price      
Closing stock price (in USD per share)   $ 26.83  
Service-based Stock Options      
Options outstanding      
Beginning balance (in shares) 2,746,670 1,999,553 2,575,579
Granted (in shares) 115,100   202,560
Exercised (in shares)   (337,376) (334,572)
Canceled or forfeited (in shares) (286,191) (21,196) (444,014)
Ending balance (in shares) 2,575,579 1,640,981 1,999,553
Options outstanding, Exercisable (in shares)   1,312,728  
Weighted-average exercise price      
Beginning balance (in USD per share) $ 12.91 $ 13.17 $ 12.24
Granted (in USD per share) 7.95   14.18
Exercised (in USD per share)   4.36 4.08
Canceled or forfeited (in USD per share) 16.98 23.24 15.07
Ending balance (in USD per share) $ 12.24 14.86 $ 13.17
Weighted-average exercise price, Exercisable (in USD per share)   $ 14.99  
Weighted-average remaining contractual life (in years), Outstanding 6 years 10 months 24 days 6 years 1 month 6 days 6 years 9 months 18 days
Weighted-average remaining contractual life (in years), Exercisable   5 years 7 months 6 days  
Aggregate intrinsic values, Outstanding $ 6,958 $ 19,650 $ 3,773
Aggregate intrinsic values, Exercisable   $ 15,549