Condensed Consolidated Statements Of Operations And Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue (includes related party revenue of $1,082 and $14,925 for the three months ended September 30, 2023 and 2022, respectively, and $11,753 and $23,190 for the six months ended September 30, 2023 and 2022, respectively)	$ 49,999	$ 75,659	$ 110,863	$ 140,172
Cost of revenue (includes related party cost of $20 and $(271) for the three months ended September 30, 2023 and 2022, respectively, and $295 and $(510) for the six months ended September 30, 2023 and 2022, respectively)	28,270	37,386	58,453	76,409
Gross profit	21,729	38,273	52,410	63,763
Operating expenses:
Research and development (includes related party expenses of $4,907 and $2,717 for the three months ended September 30, 2023 and 2022, respectively, and $8,208 and $6,266 for the six months ended September 30, 2023 and 2022, respectively)	54,588	52,598	116,917	104,607
Sales and marketing	18,328	24,835	40,986	58,269
General and Administrative	25,290	28,881	76,030	58,524
Restructuring and other charges	2,654	0	6,871	0
Total operating expenses	100,860	106,314	240,804	221,400
Loss from operations	(79,131)	(68,041)	(188,394)	(157,637)
Other income (expense):
Interest income, net	3,752	1,392	8,059	1,637
Other income (expense), net	145	(687)	477	(1,122)
Loss before income taxes	(75,234)	(67,336)	(179,858)	(157,122)
Provision for (benefit from) income taxes	36	(1,271)	36	(1,525)
Net loss	(75,270)	(66,065)	(179,894)	(155,597)
Other comprehensive income, net of tax	954	829	620	1,453
Total comprehensive loss	$ (74,316)	$ (65,236)	$ (179,274)	$ (154,144)
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	$ (0.16)	$ (0.15)	$ (0.38)	$ (0.35)
Net loss per share attributable to common stockholders, diluted	$ (0.16)	$ (0.15)	$ (0.38)	$ (0.35)
Weighted-average shares used to compute net loss per share:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic	474,858,266	449,899,537	468,592,009	448,211,708
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted	474,858,266	449,899,537	468,592,009	448,211,708