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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Stockholders' Equity [Abstract]

Summary of Stock Option Activity



			Stock Options Outstanding
								Weighted
	Shares available		Number					average
	for grant		of shares		Exercise price			exercise price
Balances, December 31, 2017	6,795		25,404		$	1.16 – 16.00		$	6.10
Additional shares reserved	6,976
Options granted	(4,141)		4,141			2.47 – 3.40			2.55
Options exercised	—		(123)			1.16 – 2.54			2.29
Options canceled	821		(821)			1.16 – 16.0			5.63
Balances, June 30, 2018	10,451		28,601		$	1.16 – 16.00		$	5.61

Summary of Time-Based RSUs Activity


			Weighted average
	Number		grant date
	of shares		fair value
RSUs outstanding at December 31, 2017	—		$	—
RSUs granted	365			2.57
RSUs released	—			—
RSUs forfeited	(10)			2.54
Unvested RSUs outstanding at June 30, 2018	355		$	2.57

Summary of Performance-Based RSUs Activity


			Weighted average
	Number		grant date
	of shares		fair value
PSUs outstanding at December 31, 2017	—		$	—
PSUs granted	657			2.58
PSUs released	—			—
PSUs forfeited	(5)			2.54
Unvested PSUs outstanding at June 30, 2018	652		$	2.58

Schedule of Stock-Based Compensation Expense



	Three-Month Periods Ended June 30,						Six-Month Periods Ended June 30,
	2018			2017			2018			2017
Cost of revenue	$	633		$	572		$	1,297		$	1,095
Research and development		2,229			2,029			4,451			4,060
Sales, general and administrative		2,362			2,408			4,758			4,839
Total stock-based compensation expense	$	5,224		$	5,009		$	10,506		$	9,994

Schedule of Fair Value of Employee Stock Options



	Three-Month Periods Ended June 30,				Six-Month Periods Ended June 30,
Stock Option	2018		2017		2018		2017
Expected term in years	5.2		6.1		5.2		6.1
Expected volatility	65%		70%		67%		70%
Risk-free interest rate	2.8%		1.9%		2.5%		2.1%
Dividend yield	—		—		—		—

Schedule of Fair Value of Employee Stock Purchase Plan



	Three-Month Periods Ended June 30,				Six-Month Periods Ended June 30,
ESPP	2018		2017		2018		2017
Expected term in years	0.5-2.0		0.5-2.0		0.5-2.0		0.5-2.0
Expected volatility	67%		70%		67%		70%
Risk-free interest rate	1.9%-2.2%		0.8%-1.3%		1.9%-2.2%		0.8%-1.3%
Dividend yield	—		—		—		—