Equity Incentive Plans and Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2023

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedule of Summary of Stock Option Activity and Activity Regarding Shares Available for Grant

Stock option activity and activity regarding shares available for grant under the 2021 Plan are as follows:

	Options Outstanding
	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 March 31, 2022		73,609,565		$	4.21	6.9		$	35,979
Granted		4,866,230		$	3.50
Exercised		(2,748,796	)	$	1.53
Canceled/forfeited/expired		(7,676,247	)	$	4.75
Balance as of March 31, 2023		68,050,752		$	4.20		6.0	$	10,621
Vested and exercisable as of March 31, 2023		48,034,690		$	4.14		5.0	$	7,743

Schedule of Assumptions Used in the Black-Scholes Option-Pricing Model

The Company estimated the fair value of options granted using the Black-Scholes option-pricing model. The fair value of stock options is being amortized on a straight-line basis over the requisite service period of the awards.

The weighted average Black-Scholes assumptions used to value stock options at the grant dates are as follows:

	Year Ended March 31,
	2023						2022						2021
	Min			Max			Min			Max			Min			Max
Expected term (years)		6.0			6.8			3.3			6.1			4.0			6.1
Expected volatility		76	%		81	%		72	%		75	%		61	%		68	%
Risk-free interest rate		2.8	%		4.2	%		1.0	%		2.5	%		0.2	%		0.5	%
Expected dividend yield	—				—		—				—		—			—

Summary of Restricted Stock Awards Activity under the Equity Incentive Plan

The following table summarizes the RSU activity under the equity incentive plans and related information:

	Unvested RSUs			Weighted-Average Grant Date Fair Value Per Share
Balance as of March 31, 2022		10,676,378		$	9.70
Granted		26,940,560		$	3.28
Vested		(7,062,152	)	$	6.23
Canceled/forfeited		(3,992,220	)	$	5.53
Balance as of March 31, 2023		26,562,566		$	4.73

Schedule of Share Based Compensation Costs

Total stock-based compensation expense, including stock-based compensation expense related to awards classified as liabilities, was included in costs and expenses as follows:

	Year Ended March 31,
	2023		2022		2021
	(in thousands)
Cost of revenue	$	10,874	$	4,029	$	858
Research and development		48,837		26,540		21,771
Sales and marketing		8,635		5,122		4,081
General and administrative		47,671		22,242		59,986
Total stock-based compensation expense	$	116,017	$	57,933	$	86,696

Employee Stock Purchase Plan

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedule of Assumptions Used in the Black-Scholes Option-Pricing Model

The Company uses the following weighted-average assumptions in the Black-Scholes model to calculate the estimated fair value of the ESPP awards:

	Year Ended March 31,
	2023						2022
	Min			Max			Min			Max
Expected term (years)		0.5			1.0			0.5			1.0
Expected volatility		78	%		109	%		77	%		86	%
Risk-free interest rate		3.3	%		5.2	%		0.6	%		0.9	%
Expected dividend yield	—				—		—				—