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Stockholders' Equity (Tables)

6 Months Ended

Jun. 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		35			2.45			2.45
Options exercised		(341)			1.16 – 4.25			2.43
Options canceled		(1,906)			2.54 – 15.77			7.39
Balances, June 30, 2020		20,485		$	1.16 – 16.00		$	5.45

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	5,280			4.34
RSUs released	(858)			6.78
RSUs forfeited	(399)			4.47
Unvested RSUs outstanding at June 30, 2020	5,109		$	4.30

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	—			—
Unvested PSUs outstanding at June 30, 2020	138		$	2.63

Schedule of Stock-Based Compensation Expense

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Cost of revenue	$	452		$	444		$	979		$	956
Research and development		1,433			1,918			3,192			3,930
Sales, general and administrative		1,349			1,727			3,095			3,584
Total stock-based compensation expense	$	3,234		$	4,089		$	7,266		$	8,470

Schedule of Fair Value of Employee Stock Options

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

Schedule of Fair Value of Employee Stock Purchase Plan

	Three Months Ended June 30,				Six Months Ended June 30,
ESPP	2020		2019		2020		2019
Expected term in years	0.5-2.0		—		0.5-2.0		—
Expected volatility	0.6		—		0.6		—
Risk-free interest rate	0.8% -1.0%		—		0.8% -1.0%		—
Dividend yield	—		—		—		—

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