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
 9 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Number of Shares (in shares)      
Beginning Balance (in shares) 9,128,885    
Granted (in shares) 1,738,750 1,349,925  
Forfeitures/cancellations (in shares) (397,321)    
Exercised (in shares) (2,169,876)    
Ending Balance (in shares) 8,300,438   9,128,885
Vested and expected to vest (net of estimated forfeitures) (in shares) 7,413,546    
Exercisable (in shares) 5,119,274    
Weighted Average Exercise Price ($ per share)      
Options outstanding (in dollars per share) $ 1.80    
Granted (in dollars per share) 4.34    
Forfeited/Cancelled (in dollars per share) 1.78    
Exercised (in dollars per share) 1.72    
Options outstanding (in dollars per share) 2.36   $ 1.80
Vested and expected to vest (net of estimated forfeitures) (in dollars per share) 2.29    
Exercisable (in dollars per share) $ 2.15    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 7 years 1 month 25 days   7 years 3 months 21 days
Vested and expected to vest (net of estimated forfeitures) 6 years 11 months 18 days    
Exercisable, December 31, 2019 6 years 3 months 10 days    
Aggregate Intrinsic Value (in thousands)      
Outstanding $ 39,656   $ 16,347
Vested and expected to vest (net of estimated forfeitures) 35,900    
Exercisable, December 31, 2019 $ 25,517