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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 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	—		(801)			1.16 – 7.05			4.84
Options canceled	542		(542)			2.54 – 16.0	0		10.27
Balances, March 31, 2019	20,333		23,833		$	1.16 – 16.00		$	5.58



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	815			7.18
RSUs released	(78)			2.58
RSUs forfeited	(6)			7.16
Unvested RSUs outstanding at March 31, 2019	1,102		$	6.17



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 released	(204)			2.57
PSUs forfeited	(244)			2.57
Unvested PSUs outstanding at March 31, 2019	138		$	2.63



Schedule of Stock-Based Compensation Expense



	Three Months Ended March 31,
	2019			2018
Cost of revenue	$	512		$	664
Research and development		2,012			2,222
Sales, general and administrative		1,857			2,396
Total stock-based compensation expense	$	4,381		$	5,282



Schedule of Fair Value of Employee Stock Options



	Three Months Ended March 31,
Stock Option	2019		2018
Expected term in years	—		5.2
Expected volatility	—		67%
Risk-free interest rate	—		2.5%
Dividend yield	—		—




Schedule of Fair Value of Employee Stock Purchase Plan



	Three Months Ended March 31,
ESPP	2019		2018
Expected term in years	—		0.5-2.0
Expected volatility	—		67%
Risk-free interest rate	—		1.9%-2.2%
Dividend yield	—		—



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