Consolidated Statements Of Operations And Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue (included related party revenue of $47,448, $46,064 and $39,917, respectively)	$ 299,489	$ 271,893	$ 243,920
Cost of revenue (includes related party costs of $530, $299 and $(1,400), respectively)	164,993	138,948	126,914
Gross profit	134,496	132,945	117,006
Operating expenses:
Research and development (includes related party expenses of $10,709, $23,954 and $18,684, respectively)	222,596	189,377	159,856
Sales and marketing	119,927	100,338	43,197
General and administrative	115,984	97,383	99,149
Total operating expenses	458,507	387,098	302,202
Loss from operations	(324,011)	(254,153)	(185,196)
Interest income, net	9,676	277	255
Change in fair value of warrant liabilities	0	(32,989)	0
Other income (expense), net	(93)	(83)	1,322
Loss before income taxes	(314,428)	(220,970)	(183,619)
Income tax benefit	(2,772)	(3,480)	0
Net loss	(311,656)	(217,490)	(183,619)
Other comprehensive income (loss), net of tax	(799)	179
Total comprehensive loss	$ (312,455)	$ (217,311)	$ (183,619)
Net loss per share of Class A and Class B common stock attributable to common stockholders:
Net loss per share attributable to common stockholders, basic	$ (0.69)	$ (0.60)	$ (1.84)
Net loss per share attributable to common stockholders, diluted	$ (0.69)	$ (0.60)	$ (1.84)
Weighted-average shares used to compute net loss per share:
Weighted Average Number of Shares Outstanding, Basic	451,504,377	361,528,119	99,660,786
Weighted Average Number of Shares Outstanding, Diluted	451,504,377	361,528,119	99,660,786