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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, 2020
Dec. 31, 2019
Mar. 31, 2020
Number of Shares      
Options outstanding, beginning (in shares) 8,984,430    
Granted (in shares) 1,937,462 1,738,750  
Forfeited / Cancelled (in shares) (282,840)    
Exercised (in shares) (1,979,387)    
Options outstanding, ending (in shares) 8,659,665   8,984,430
Vested and expected to vest (net of estimated forfeitures) (in shares) 7,784,550    
Exercisable (in shares) 4,870,289    
Weighted Average Exercise Price (per share)      
Options outstanding, beginning (in dollars per share) $ 2.75    
Granted (in dollars per share) 6.47    
Forfeited/Cancelled (in dollars per share) 5.58    
Exercised (in dollars per share) 2.99    
Options outstanding, ending (in dollars per share) 3.44   $ 2.75
Vested and expected to vest (net of estimated forfeitures) (in dollars per share) 3.14    
Exercisable (in dollars per share) $ 2.43    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 7 years 1 month 9 days   7 years 2 months 1 day
Vested and expected to vest (net of estimated forfeitures) 6 years 10 months 24 days    
Exercisable 6 years 1 month 6 days    
Aggregate Intrinsic Value (in thousands)      
Outstanding $ 460,038   $ 16,517
Vested and expected to vest (net of estimated forfeitures) 415,871    
Exercisable $ 263,634