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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2017

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, 2016	6,835		22,501		$	1.16 – 16.00		$	6.30
Additional shares reserved	4,634
Options granted	(5,258)		5,258			3.30 – 5.27			5.10
Options exercised	—		(1,231)			1.16 – 4.55			2.54
Options canceled	936		(936)			1.16 – 16.0			7.24
Balances, June 30, 2017	7,147		25,592		$	1.16 – 16.00		$	6.20

Schedule Of Stock-Based Compensation Expense



	Three-Month Periods Ended June 30,						Six-Month Periods Ended June 30,
	2017			2016			2017			2016
Cost of revenue	$	572		$	562		$	1,095		$	1,061
Research and development		2,029			2,131			4,060			4,041
Sales, general and administrative		2,408			2,345			4,839			4,517
Total stock-based compensation expense	$	5,009		$	5,038		$	9,994		$	9,619

Schedule Of Fair Value Of Employee Stock Options



	Three-Month Periods Ended June 30,				Six-Month Periods Ended June 30,
Stock Option	2017		2016		2017		2016
Expected term in years	6.1		6.1		6.1		6.1
Expected volatility	70%		70%		70%		70%
Risk-free interest rate	1.9%		1.4%		2.1%		1.5%
Dividend yield	—		—		—		—

Schedule Of Fair Value Of Employee Stock Purchase Plan



	Three-Month Periods Ended June 30,				Six-Month Periods Ended June 30,
ESPP	2017		2016		2017		2016
Expected term in years	0.5-2.0		0.5-2.0		0.5-2.0		0.5-2.0
Expected volatility	70%		70%		70%		70%
Risk-free interest rate	0.8%-1.3%		0.5%-0.9%		0.8%-1.3%		0.5%-0.9%
Dividend yield	—		—		—		—