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Stock-based compensation - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Number of Shares    
Outstanding at beginning of the period (in shares) 3,721,784  
Granted (in shares) 1,637,035  
Exercised (in shares) (207,673)  
Cancelled (in shares) (186,765)  
Outstanding at end of the period (in shares) 4,964,381 3,721,784
Options exercisable (in shares) 2,117,721 1,278,330
Weighted Average Exercise Price    
Outstanding at beginning of the period (in dollars per share) $ 7.14  
Granted (in dollars per share) 15.07  
Exercised (in dollars per share) 2.65  
Cancelled (in dollars per share) 11.48  
Outstanding at end of the period (in dollars per share) 9.78 $ 7.14
Options exercisable (in dollars per share) $ 5.66 $ 2.51
Weighted Average Contractual Term (Years)    
Outstanding (years) 8 years 7 days 8 years 7 months 10 days
Granted (years) 9 years 2 months 16 days  
Options exercisable (years) 7 years 2 months 12 days 7 years 9 months
Aggregate Intrinsic Value    
Outstanding at beginning of the period $ 30,150  
Outstanding at end of the period 15,344 $ 30,150
Options exercisable $ 11,733 $ 16,249
Weighted average grant-date fair value per share of stock options granted $ 9.70 $ 8.82
Total fair value of options vested $ 5,440 $ 1,298
Outstanding unvested service-based stock options 0