Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans - Summary of Stock Option Activity (Details)

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Description of Stock Plans - Summary of Stock Option Activity (Details) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Number of Shares      
Options outstanding, beginning (in shares) 8,984,430    
Granted (in shares) 1,902,804 1,603,750  
Forfeited / Cancelled (in shares) (139,630)    
Exercised (in shares) (1,283,656)    
Options outstanding, ending (in shares) 9,463,948   8,984,430
Vested and expected to vest (net of estimated forfeitures) (in shares) 8,299,954    
Exercisable (in shares) 5,106,976    
Weighted Average Exercise Price (per share)      
Options outstanding, beginning (in dollars per share) $ 2.75    
Granted (in dollars per share) 6.04    
Forfeited/Cancelled (in dollars per share) 5.19    
Exercised (in dollars per share) 2.74    
Options outstanding, ending (in dollars per share) 3.38   $ 2.75
Vested and expected to vest (net of estimated forfeitures) (in dollars per share) 3.09    
Exercisable (in dollars per share) $ 2.40    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 7 years 3 months 18 days   7 years 2 months 1 day
Vested and expected to vest (net of estimated forfeitures) 7 years 18 days    
Exercisable 6 years 1 month 17 days    
Aggregate Intrinsic Value (in thousands)      
Outstanding $ 277,897   $ 16,517
Vested and expected to vest (net of estimated forfeitures) 246,099    
Exercisable $ 154,943