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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Stockholders' Equity [Abstract]

Summary of Stock Option Activity

		Stock Options Outstanding
							Weighted
		Number					average
		of shares		Exercise price			exercise price
Balances, December 31, 2020		14,638		$	1.16 – 20.90		$	5.53
Options granted		1,697			31.18 – 46.37			37.37
Options exercised		(3,558)			1.16 – 15.98			5.43
Options canceled		(445)			2.54 – 5.27			3.79
Balances, March 31, 2021		12,332		$	1.16 – 46.37		$	10.00

Summary of Time-Based RSUs Activity

			Weighted average
	Number		grant date
	of shares		fair value
RSUs outstanding at December 31, 2020	5,919		$	5.25
RSUs granted	2,123			42.39
RSUs released	(1,412)			4.45
RSUs forfeited	(103)			12.10
Unvested RSUs outstanding at March 31, 2021	6,527		$	17.40

Summary of Performance-Based RSUs Activity

			Weighted average
	Number		grant date
	of shares		fair value
PSUs outstanding at December 31, 2020	94		$	2.63
PSUs granted	—			—
PSUs released	—			—
PSUs forfeited	(94)			2.63
Unvested PSUs outstanding at March 31, 2021	—		$	—

Schedule of Stock-Based Compensation Expense

	Three Months Ended March 31,
	2021			2020
Cost of revenue	$	992		$	527
Research and development		3,048			1,759
Sales, general and administrative		6,125			1,746
Total stock-based compensation expense	$	10,165		$	4,032

Schedule of Fair Value of Employee Stock Options

	Three Months Ended March 31,
Stock Option	2021		2020
Expected term in years	4.6		5.1
Expected volatility	68%		57%
Risk-free interest rate	0.50%		1.20%
Dividend yield	—		—

Schedule of Fair Value of Employee Stock Purchase Plan

	Three Months Ended March 31,
ESPP	2021		2020
Expected term in years	0.5 - 2.0		0.5 - 2.0
Expected volatility	68%		57%
Risk-free interest rate	0.07% - 0.13%		0.8% - 1.0%
Dividend yield	—		—

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