Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Redeemable convertible preferred stock, Shares, Authorized		209,512,070
Redeemable convertible preferred stock, Shares, Issued		209,181,855
Redeemable convertible preferred stock, Shares, Outstanding	0	209,181,855
Carrying value		$ 837,351
Redeemable convertible preferred stock, Liquidation Preference		$ 874,107
Series A [Member]
Redeemable convertible preferred stock, Shares, Authorized		16,330,984
Redeemable convertible preferred stock, Shares, Issued		16,330,984
Redeemable convertible preferred stock, Shares, Outstanding		16,330,984
Carrying value		$ 8,815
Redeemable convertible preferred stock, Liquidation Preference		$ 8,953
Series B [Member]
Redeemable convertible preferred stock, Shares, Authorized		20,754,666
Redeemable convertible preferred stock, Shares, Issued		20,754,666
Redeemable convertible preferred stock, Shares, Outstanding		20,754,666
Carrying value		$ 27,643
Redeemable convertible preferred stock, Liquidation Preference		$ 27,779
Series C [Member]
Redeemable convertible preferred stock, Shares, Authorized		22,703,050
Redeemable convertible preferred stock, Shares, Issued		22,703,050
Redeemable convertible preferred stock, Shares, Outstanding		22,703,050
Carrying value		$ 30,961
Redeemable convertible preferred stock, Liquidation Preference		$ 31,179
Series D [Member]
Redeemable convertible preferred stock, Shares, Authorized		33,110,992
Redeemable convertible preferred stock, Shares, Issued		33,110,992
Redeemable convertible preferred stock, Shares, Outstanding		33,110,992
Carrying value		$ 58,274
Redeemable convertible preferred stock, Liquidation Preference		$ 58,450
Series E [Member]
Redeemable convertible preferred stock, Shares, Authorized		24,414,254
Redeemable convertible preferred stock, Shares, Issued		24,414,254
Redeemable convertible preferred stock, Shares, Outstanding		24,414,254
Carrying value		$ 114,936
Redeemable convertible preferred stock, Liquidation Preference		$ 115,246
Series F [Member]
Redeemable convertible preferred stock, Shares, Authorized		41,300,501
Redeemable convertible preferred stock, Shares, Issued		41,300,501
Redeemable convertible preferred stock, Shares, Outstanding		41,300,501
Carrying value		$ 242,168
Redeemable convertible preferred stock, Liquidation Preference		$ 250,000
Series F-1 [Member]
Redeemable convertible preferred stock, Shares, Authorized		50,897,623
Redeemable convertible preferred stock, Shares, Issued		50,567,408
Redeemable convertible preferred stock, Shares, Outstanding		50,567,408
Carrying value		$ 354,554
Redeemable convertible preferred stock, Liquidation Preference		$ 382,500