Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Redeemable Convertible Preferred Stock [Member]
Temporary equity beginning balance (in Shares) at Mar. 31, 2018         69,152,275
Temporary equity beginning balance at Mar. 31, 2018         $ 482,797
Beginning balance (in Shares) at Mar. 31, 2018   33,011,344      
Beginning balance at Mar. 31, 2018 $ (306,785)   $ 52,438 $ (359,223)  
Issuance of Series F-1 redeemable convertible preferred stock (in Shares)         17,291,066
Issuance of Series F-1 redeemable convertible preferred stock         $ 272,286
Issuance of common stock upon exercise of stock options (in Shares)   3,135,088      
Issuance of common stock upon exercise of stock options 5,821   5,821    
Issuance of common stock related to early exercise of stock options (in Shares)   5,777,084      
Vesting of early exercised stock options 5,654   5,654    
Stock-based compensation expense 37,561   37,561    
Net loss (183,533)     (183,533)  
Temporary equity ending balance (in Shares) at Mar. 31, 2019         86,443,341
Temporary equity ending balance at Mar. 31, 2019         $ 755,083
Ending balance (in Shares) at Mar. 31, 2019   41,923,516      
Ending balance at Mar. 31, 2019 (441,282)   101,474 (542,756)  
Issuance of common stock upon exercise of stock options (in Shares)   2,394,782      
Issuance of common stock upon exercise of stock options 8,732   8,732    
Vesting of early exercised stock options 16,962   16,962    
Stock-based compensation expense 45,568   45,568    
Net loss $ (250,863)     (250,863)  
Temporary equity ending balance (in Shares) at Mar. 31, 2020 86,443,341       86,443,341
Temporary equity ending balance at Mar. 31, 2020         $ 755,083
Ending balance (in Shares) at Mar. 31, 2020   44,318,298      
Ending balance at Mar. 31, 2020 $ (620,883)   172,736 (793,619)  
Issuance of Series F-1 redeemable convertible preferred stock (in Shares)         4,755,037
Issuance of Series F-1 redeemable convertible preferred stock         $ 82,268
Issuance of common stock upon exercise of stock options (in Shares)   5,130,613      
Issuance of common stock upon exercise of stock options 29,092   29,092    
Issuance of common stock related to early exercise of stock options (in Shares)   4,843,229      
Vesting of early exercised stock options 91,046   91,046    
Stock-based compensation expense 88,745   88,745    
Net loss $ (183,619)     (183,619)  
Temporary equity ending balance (in Shares) at Mar. 31, 2021 91,198,378       91,198,378
Temporary equity ending balance at Mar. 31, 2021         $ 837,351
Ending balance (in Shares) at Mar. 31, 2021   54,292,140      
Ending balance at Mar. 31, 2021 $ (595,619)   $ 381,619 $ (977,238)