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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2019

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, 2018	12,279		25,176		$	1.16 – 16.00		$	5.66
Additional shares reserved	7,512
Options granted	—		—			—			—
Options exercised	—		(1,157)			1.16 – 7.05			4.84
Options canceled	971		(971)			2.54 – 16.00			8.33
Balances, September 30, 2019	20,762		23,048		$	1.16 – 16.00		$	5.59



Summary of Time-Based RSUs Activity


			Weighted average
	Number		grant date
	of shares		fair value
RSUs outstanding at December 31, 2018	371		$	3.20
RSUs granted	854			7.16
RSUs vested	(80)			2.58
RSUs forfeited	(51)			5.66
Unvested RSUs outstanding at September 30, 2019	1,094		$	6.22



Summary of Performance-Based RSUs Activity


			Weighted average
	Number		grant date
	of shares		fair value
PSUs outstanding at December 31, 2018	586		$	2.58
PSUs granted	—			—
PSUs vested	(204)			2.57
PSUs forfeited	(244)			2.57
Unvested PSUs outstanding at September 30, 2019	138		$	2.63



Schedule of Stock-Based Compensation Expense



	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Cost of revenue	$	450		$	608		$	1,406		$	1,905
Research and development		1,906			2,207			5,836			6,658
Sales, general and administrative		1,706			2,310			5,290			7,068
Total stock-based compensation expense	$	4,062		$	5,125		$	12,532		$	15,631



Schedule of Fair Value of Employee Stock Options



	Three Months Ended September 30,				Nine Months Ended September 30,
Stock Option	2019		2018		2019		2018
Expected term in years	—		5.2		—		5.2
Expected volatility	—		65%		—		67%
Risk-free interest rate	—		2.8%		—		2.5%
Dividend yield	—		—		—		—




Schedule of Fair Value of Employee Stock Purchase Plan



	Three Months Ended September 30,				Nine Months Ended September 30,
ESPP	2019		2018		2019		2018
Expected term in years	—		0.5-2.0		—		0.5-2.0
Expected volatility	—		65%		—		65% - 67%
Risk-free interest rate	—		1.3%-2.7%		—		1.3%-2.7%
Dividend yield	—		—		—		—



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