Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Description of Stock Plans - Summary of Options Granted under all Equity Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Number of Shares      
Forfeited/Canceled (in shares) (489,785)    
Stock Option      
Number of Shares      
Beginning Balance (in shares) 9,128,885 9,741,969  
Granted (in shares) 2,624,244 1,463,925 1,963,378
Forfeited/Canceled (in shares) (488,952) (1,552,192)  
Exercised (in shares) (2,279,747) (524,817)  
Ending Balance (in shares) 8,984,430 9,128,885 9,741,969
Vested and expected to vest (in shares) 7,987,627    
Exercisable (in shares) 5,377,389    
Weighted-Average Exercise Price (per share)      
Beginning Balance (in dollars per share) $ 1.80 $ 2.08  
Granted (in dollars per share) 5.00 1.69  
Forfeited/Canceled (in dollars per share) 2.05 3.72  
Exercised (in dollars per share) 1.70 0.94  
Ending Balance (in dollars per share) 2.75 $ 1.80 $ 2.08
Vested and expected to vest (net of estimated forfeitures) (in dollars per share) 2.59    
Exercisable (in dollars per share) $ 2.21    
Weighted-Average Remaining Contractual Life (in years)      
Outstanding 7 years 1 month 30 days 7 years 3 months 21 days 7 years 9 months 25 days
Vested and expected to vest (net of estimated forfeitures) 6 years 11 months 15 days    
Exercisable, March 31, 2020 6 years 1 month 28 days    
Aggregate Intrinsic Value (in thousands)      
Balance $ 16,517 $ 16,347 $ 6,286
Vested and expected to vest (net of estimated forfeitures) 15,424    
Exercisable, March 31, 2020 $ 11,552