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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity [Abstract]

Summary of Stock Option Activity



			Stock Options Outstanding
	Shares available		Number					Weighted 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	(4,204)		4,204		$	2.47 – 4.28		$	2.57
Options exercised	—		(1,720)		$	1.16 – 7.05		$	3.73
Options canceled	2,712		(2,712)		$	1.16 – 16.00		$	6.19
Balances, December 31, 2018	12,279		25,176		$	1.16 – 16.00		$	5.66



Reconciliation of Outstanding and Exercisable Stock Options



			Options Outstanding							Options Exercisable
					Weighted average
			Number		remaining contractual		Weighted average			Number		Weighted average
	Exercise price		outstanding		life (Years)		exercise price			vested		exercise price
	$	0.00 – 1.60	438,233		3.84		$	1.18		438,233		$	1.18
	$	1.60 – 3.20	6,141,372		7.30		$	2.53		2,877,885		$	2.47
	$	3.20 – 4.80	3,587,706		4.63		$	4.07		3,064,649		$	4.10
	$	4.80 – 6.40	6,390,401		6.98		$	5.45		4,258,318		$	5.53
	$	6.40 – 8.00	2,868,379		5.74		$	7.19		2,604,086		$	7.14
	$	8.00 – 9.60	3,560,966		5.24		$	8.77		2,853,592		$	8.76
	$	9.60 – 11.20	1,293,448		5.82		$	10.20		1,035,715		$	10.23
	$	11.20 – 12.80	449,502		2.00		$	12.13		449,502		$	12.13
	$	12.80 – 14.40	323,250		1.08		$	13.94		3,227,035		$	13.94
	$	14.40 – 16.00	122,750		1.49		$	15.99		122,750		$	15.99
			25,176,007		6.03		$	5.66		18,027,465		$	6.09




Summary of Time-Based RSUs Activity


			Weighted average
	Number		grant date
	of shares		fair value
RSUs outstanding at December 31, 2017	—		$	—
RSUs granted	413			3.14
RSUs released	—			—
RSUs forfeited	(42)			2.54
Unvested RSUs outstanding at December 31, 2018	371		$	3.20



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	(71)			2.54
Unvested PSUs outstanding at December 31, 2018	586		$	2.58



Schedule of Stock-Based Compensation Expense



	Years Ended December 31,
	2018			2017			2016
Cost of revenue	$	3,124		$	2,311		$	2,133
Research and development		10,076			8,506			8,257
Sales, general and administrative		9,953			9,535			9,172
Total stock-based compensation expense	$	23,153		$	20,352		$	19,562



Schedule of Fair Value of Employee Stock Options



		Years Ended December 31,
		2018			2017			2016
Expected term (years)			5.2 years			6.1 years			6.1 years
Expected volatility			66.8%			70.0%			70.0%
Risk-free interest rate			2.6%			2.1%			1.5%
Dividend yield			—			—			—




Schedule of Fair Value of Employee Stock Purchase Plan



		Years Ended December 31,
		2018			2017			2016
Expected term (years)			0.5 - 2.0			0.5 - 2.0			0.5 - 2.0
Expected volatility			65% - 67%			70.0%			70.0%
Risk-free interest rate			1.3%-2.7%			0.8%-1.4%			0.5%-0.9%
Dividend yield			—			—			—



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