Annual report pursuant to Section 13 and 15(d)

Description of Stock Plans - Summary of Options Granted under all Equity Plans (Detail)

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Description of Stock Plans - Summary of Options Granted under all Equity Plans (Detail) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Number of Shares      
Beginning Balance (in shares) 8,984,430 9,128,885  
Granted (in shares) 1,999,997 2,624,244 1,463,925
Forfeited/Canceled (in shares) (331,599) (488,952)  
Exercised (in shares) (2,506,383) (2,279,747)  
Ending Balance (in shares) 8,146,445 8,984,430 9,128,885
Vested and expected to vest (in shares) 7,994,718    
Exercisable (in shares) 5,469,049    
Weighted-Average Exercise Price (per share)      
Beginning Balance (in dollars per share) $ 2.75 $ 1.80  
Granted (in dollars per share) 8.49 5.00  
Forfeited/Canceled (in dollars per share) 5.61 2.05  
Exercised (in dollars per share) 2.87 1.70  
Ending Balance (in dollars per share) 4.01 $ 2.75 $ 1.80
Vested and expected to vest (net of estimated forfeitures) (in dollars per share) 3.92    
Exercisable (in dollars per share) $ 2.39    
Weighted-Average Remaining Contractual Life (in years)      
Outstanding 6 years 10 months 9 days 7 years 2 months 1 day 7 years 3 months 21 days
Vested and expected to vest (net of estimated forfeitures) 6 years 9 months 25 days    
Exercisable, March 31, 2021 5 years 11 months 1 day    
Aggregate Intrinsic Value (in thousands)      
Balance $ 622,249 $ 16,517 $ 16,347
Vested and expected to vest (net of estimated forfeitures) 611,356    
Exercisable, March 31, 2021 $ 426,418