Equity Incentive Plan (Tables)
 12 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]  
Summary Of Stock Option Activity And Activity Regarding Shares Available For Grant Under The Plan
Stock option activity and activity regarding shares available for grant under the Plan is as follows:
 
                     
   
Options Outstanding
 
   
Shares
Available for
Grant
  
Outstanding
Stock
Options
  
Weighted-
Average
Exercise
Price
   
Weighted-
Average
Remaining
Contractual
Life (Years)
   
Aggregate
Intrinsic
Value
 
   
(in thousands, except share, years, and per share data)
 
Balance as of April 1, 2018
   8,876,172   24,203,058  $5.05    8.0   $134,591 
Shares authorized
   12,000,000   —                 
Granted
   (14,265,875)   14,265,875   11.11           
Exercised
   —     (8,912,172)   8.11         29,900 
Cancelled/Forfeited/Expired
   1,489,611   (1,489,611)   8.80           
   
 
 
  
 
 
  
 
 
   
 
 
   
 
 
 
Balance as of March 31, 2019
   8,099,908   28,067,150  $6.97    7.8   $128,583 
Granted
   (7,061,920)   7,061,920   11.55           
Exercised
   —     (2,394,782)   3.65         18,967 
Cancelled/Forfeited/Expired
   2,916,722   (2,916,722)   10.30           
   
 
 
  
 
 
  
 
 
   
 
 
   
 
 
 
Balance as of March 31, 2020
   3,954,710   29,817,566  $7.99    7.5   $106,688 
Shares authorized
   6,600,000   —                 
Granted
   (11,957,813)   11,957,813   11.57           
Exercised
   —     (9,973,842)   7.65         47,571 
Cancelled/Forfeited/Expired
   2,426,511   (2,426,511)   10.29           
   
 
 
  
 
 
  
 
 
   
 
 
   
 
 
 
Balance as of March 31, 2021
   1,023,408   29,375,026  $9.37    7.1   $403,498 
   
 
 
  
 
 
  
 
 
   
 
 
   
 
 
 
Vested and exercisable as of March 31, 2021
       16,164,320  $7.77    5.8   $248,018 
Summary Of The Black-Scholes Assumptions Used To Value Stock Options At The Grant Dates
The Black-Scholes assumptions used to value stock options at the grant dates are as follows:
 
                         
   
Year Ended March 31,
 
   
2021
  
2020
  
2019
 
   
Min
  
Max
  
Min
  
Max
  
Min
  
Max
 
Expected term (years)
   4.0   6.1   5.0   6.1   5.0   6.3 
Expected volatility
   61%   68%   53%   62%   52%   54% 
       
Risk-free interest rate
   0.2%   0.5%   0.6%   2.2%   2.5%   3.1% 
       
Expected dividend yield
   0%   0%   0%   0%   0%   0% 
Summary Of The Total Share-Based Compensation Expense Related To Stock Options
The total share-based compensation expense related to stock options by line item in the accompanying consolidated statements of operations is summarized as follows:
 
             
   
Year Ended March 31,
 
   
2021
   
2020
   
2019
 
   
(in thousands)
 
Cost of revenue
  $858   $733   $740 
Research and development
   21,771    16,524    13,789 
Sales and marketing
   4,081    3,988    3,616 
General and administrative
   59,986    18,932    12,154 
Restructuring and other charges
   —      881    —   
   
 
 
   
 
 
   
 
 
 
Total stock-based compensation expense
  $86,696   $41,058   $30,299 
   
 
 
   
 
 
   
 
 
 
Secondary Sale Transactions  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]  
Summary Of The Total Share-Based Compensation Expense Related To Stock Options
Total stock-based compensation expense related to the secondary sale transactions by line item included in the consolidated statements of operations for the fiscal years ended March 31, 2021, 2020 and 2019 is summarized as follows:
 
             
   
Year Ended March 31,
 
   
2021
   
2020
   
2019
 
   
(in thousands)
 
Cost of revenue
  $2   $15   $4 
Research and development
   48    2,510    2,282 
Sales and marketing
   9    360    702 
General and administrative
   1,670    895    4,204 
   
 
 
   
 
 
   
 
 
 
Total stock-based compensation expense
  $1,729   $3,780   $7,192