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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Stockholders' Equity [Abstract]

Summary of Stock Option Activity

		Stock Options Outstanding
							Weighted
		Number					average
		of shares		Exercise price			exercise price
Balances, December 31, 2019		22,697		$	1.16 – 16.00		$	5.57
Options granted		2,717			2.45 – 9.6			6.61
Options exercised		(2,763)			1.16 – 6.98			4.25
Options canceled		(2,730)			1.16 – 15.77			7.61
Balances, September 30, 2020		19,921		$	1.16 – 16.00		$	5.62

Summary of Time-Based RSUs Activity

			Weighted average
	Number		grant date
	of shares		fair value
RSUs outstanding at December 31, 2019	1,086		$	6.12
RSUs granted	6,395			4.84
RSUs released	(876)			6.76
RSUs forfeited	(634)			4.40
Unvested RSUs outstanding at September 30, 2020	5,971		$	4.84

Summary of Performance-Based RSUs Activity

			Weighted average
	Number		grant date
	of shares		fair value
PSUs outstanding at December 31, 2019	138		$	2.63
PSUs granted	—			—
PSUs released	—			—
PSUs forfeited	(44)			2.63
Unvested PSUs outstanding at September 30, 2020	94		$	2.63

Schedule of Stock-Based Compensation Expense

	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Cost of revenue	$	735		$	450		$	1,714		$	1,406
Research and development		2,105			1,906			5,297			5,836
Sales, general and administrative		2,152			1,706			5,247			5,290
Total stock-based compensation expense	$	4,992		$	4,062		$	12,258		$	12,532

Schedule of Fair Value of Employee Stock Options

	Three Months Ended September 30,				Nine Months Ended September 30,
Stock Option	2020		2019		2020		2019
Expected term in years	5.1		—		5.1		—
Expected volatility	71%		—		57% - 71%		—
Risk-free interest rate	0.3%		—		0.3% - 1.2%		—
Dividend yield	—		—		—		—

Schedule of Fair Value of Employee Stock Purchase Plan

	Three Months Ended September 30,				Nine Months Ended September 30,
ESPP	2020		2019		2020		2019
Expected term in years	0.5 - 2.0		—		0.5 - 2.0		—
Expected volatility	71%		—		57% - 71%		—
Risk-free interest rate	0.1%		—		0.1% -1.0%		—
Dividend yield	—		—		—		—

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