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Stockholders' Equity and Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2024

Equity [Abstract]

Schedule of Reserved Shares of Common Stock

The Company has reserved shares of its Class A common stock as follows:

		As of December 31, 2024				As of December 31, 2023
2014 Stock Option and Grant Plan and 2021 Incentive Award Plan:
Equity plan stock options outstanding			11,501,725				14,268,055
RSUs outstanding			13,519,769				11,301,279
Shares available for future issuance			18,310,859				18,260,813
2021 Employee Stock Purchase Plan:
Shares available for future issuance			4,810,524				4,079,994
Total reserved shares			48,142,877				47,910,141

Summary of Stock Option Activity

Option activity under the Company's combined stock plans is set forth below:

										Weighted
						Weighted				average				Aggregate
		Outstanding				average				remaining				intrinsic
		stock				exercise				contractual				value
		options				price				life (years)				(in thousands)
Balances as of December 31, 2023			14,268,055			$	4.40				6.27			$	118,757
Granted			—				—
Exercised			(2,256,288	)			2.89
Cancelled/forfeited			(510,042	)			10.81
Balances as of December 31, 2024(1)			11,501,725			$	4.41				5.25			$	70,628
Exercisable as of December 31, 2024(2)			10,998,001			$	4.05				5.16			$	71,436

(1)As no forfeitures are estimated due to the Company's adoption of ASU No. 2016-09, all options are vested or expected to vest. As of December 31, 2024, no options were outstanding that were subject to a future performance condition

(2)Exercisable shares include vested options as well as unvested shares that can be early exercised

Schedule of Assumptions and Data Inputs to Estimate Fair Value of Options

The following range of assumptions and data inputs were used in the Black-Scholes option-pricing model to estimate the fair value of the options granted under the 2021 Plan:

		Year Ended December 31,
		2024				2023				2022
Fair value of common stock			—			$11.37 - $12.37				$14.62 - $15.63
Expected dividend yield			—				—				—
Risk-free interest rate			—			3.59% - 4.36%				3.01% - 3.36%
Expected volatility			—			56.5% - 56.8%				55.3% - 55.6%
Expected term (years)			—			5.5 - 6.0				6.0 - 6.3

Schedule of RSU Activity

RSU activity for the year ended December 31, 2024 was as follows:

		Restricted stock units				Weighted-average grant date fair value per share
Balance as of December 31, 2023			11,301,279			$	14.76
Granted			12,135,585				9.59
Vested			(6,794,806	)			13.59
Cancelled/forfeited			(3,122,289	)			13.45
Balance as of December 31, 2024			13,519,769			$	11.02

Schedule of Stock-based Compensation Expense

Stock-based compensation expense, net of actual forfeitures is reflected in the consolidated statement of operations and comprehensive loss (in thousands):

		Year Ended December 31,
		2024				2023				2022
Cost of revenue		$	6,472			$	7,300			$	6,468
Research and development			44,421				36,643				27,855
Sales and marketing			32,119				29,404				17,143
General and administrative			17,007				14,085				15,757
Restructuring and other related charges			—				853				—
Total stock-based compensation expense		$	100,019			$	88,285			$	67,223

Schedule of Fair Value of Shares To be Granted Under the ESPP

The following assumptions were used to calculate the fair value of shares to be granted under the ESPP during the period utilizing the Black-Scholes option-pricing model:

		Year Ended December 31,
		2024				2023				2022
Fair value of common stock		$9.34 - $9.59				$9.98 - $10.76				$14.77 - $17.04
Expected dividend yield			—				—				—
Risk-free interest rate		4.34% - 5.43%				4.75% - 5.41%				1.54% - 4.63%
Expected volatility		44.4% - 56.0%				56.8% - 60.0%				60.0%
Expected term (years)		0.5 - 1.0				0.5 - 1.0				0.5 - 1.0

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