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Stock-based compensation - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Number of Shares    
Outstanding at beginning of the period (in shares) 4,964,381  
Granted (in shares) 2,622,519  
Exercised (in shares) (794,477)  
Cancelled (in shares) (332,239)  
Outstanding at end of the period (in shares) 6,460,184 4,964,381
Options exercisable (in shares) 2,698,708 2,117,721
Weighted Average Exercise Price    
Outstanding at beginning of the period (in dollars per share) $ 9.78  
Granted (in dollars per share) 18.10  
Exercised (in dollars per share) 7.23  
Cancelled (in dollars per share) 14.00  
Outstanding at end of the period (in dollars per share) 13.26 $ 9.78
Options exercisable (in dollars per share) $ 8.38 $ 5.67
Weighted Average Contractual Term (Years)    
Outstanding (years) 7 years 11 months 12 days 8 years 11 days
Granted (years) 9 years 2 months 19 days  
Exercised (years) 6 years 4 months 28 days  
Options exercisable (years) 6 years 9 months 15 days 7 years 2 months 12 days
Aggregate Intrinsic Value    
Outstanding at beginning of the period $ 15,345  
Exercised 24,859  
Outstanding at end of the period 116,193 $ 15,345
Options exercisable $ 59,717 $ 11,733
Weighted average grant-date fair value per share of stock options granted $ 12.03 $ 9.70
Total fair value of options vested $ 10,182 $ 5,440
Intrinsic value of stock options exercised $ 24,900 2,300
Expenses expected to be recognized over a weighted average remaining period 3 years  
Unrecognized compensation cost related to unvested common stock options $ 35,600 $ 18,700