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Share-based compensation - Summary of Stock Option Activity (Detail) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement, Disclosure [Abstract]      
Number of shares, Outstanding, beginning 4,856,972 5,686,454  
Number of shares, Exercisable, beginning   1,299,954  
Number of shares, Granted 998,000 915,097  
Number of shares, Exercised   (1,299,954)  
Number of shares, Forfeited (342,750) (444,625)  
Number of shares, Outstanding, ending 5,512,222 4,856,972 5,686,454
Weighted average exercise price, Outstanding, beginning $ 2.26 $ 1.49  
Weighted average exercise price, Exercisable, beginning   0.001  
Weighted average exercise price, Granted 4.13 4.03  
Weighted average exercise price, Exercised 3.49 0.001  
Weighted average exercise price, Forfeited $ 3.36 2.45  
Weighted average exercise price, Outstanding, ending   $ 2.26 $ 1.49
Weighted average remaining contractual term, Outstanding   6 years 8 months 5 years 10 months 10 days
Weighted average remaining contractual term, Exercisable 6 years 3 months 25 days   5 years 6 months 24 days
Aggregate intrinsic value, Outstanding, beginning $ 39,472,000 $ 34,717,000  
Aggregate intrinsic value, Exercisable, beginning   9,878,000  
Aggregate intrinsic value, Outstanding, ending $ 29,360,000 $ 39,472,000 $ 34,717,000
Weighted average fair value, Outstanding, beginning $ 2.72 $ 1.68  
Weighted average fair value, Exercisable   $ 1.83  
Weighted average fair value, Granted 2.49 $ 5.02  
Weighted average fair value, Forfeited 4.00 1.89  
Weighted average fair value, Outstanding, ending $ 3.28 $ 2.72 $ 1.68