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Stockholders' Equity (Tables)

9 Months Ended

Sep. 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	(4,183)		4,183			2.47 – 4.28			2.56
Options exercised	—		(340)			1.16 – 5.27			2.49
Options canceled	1,850		(1,850)			1.16 – 16.0			6.12
Balances, September 30, 2018	11,438		27,397		$	1.16 – 16.00		$	5.60



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	(16)			2.54
Unvested RSUs outstanding at September 30, 2018	349		$	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	(23)			2.54
Unvested PSUs outstanding at September 30, 2018	634		$	2.58



Schedule of Stock-Based Compensation Expense



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Cost of revenue	$	608		$	608		$	1,905		$	1,703
Research and development		2,207			2,071			6,658			6,131
Sales, general and administrative		2,310			2,289			7,068			7,128
Total stock-based compensation expense	$	5,125		$	4,968		$	15,631		$	14,962



Schedule of Fair Value of Employee Stock Options



	Three Months Ended September 30,				Nine Months Ended September 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 Months Ended September 30,				Nine Months Ended September 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	65%		70%		65% - 67%		70%
Risk-free interest rate	1.3%-2.7%		1.1%-1.4%		1.3%-2.7%		0.8%-1.4%
Dividend yield	—		—		—		—



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