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Stockholders' Equity (Tables)

9 Months Ended

Sep. 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	(5,600)		5,600			3.30 – 5.37			5.05
Options exercised	—		(1,369)			1.16 – 5.27			2.55
Options canceled	1,599		(1,599)			1.16 – 16.0			7.08
Balances, September 30, 2017	7,468		25,133		$	1.16 – 16.0		$	6.18

Schedule Of Stock-Based Compensation Expense



	Three-Month Periods Ended September 30,						Nine-Month Periods Ended September 30,
	2017			2016			2017			2016
Cost of revenue	$	608		$	549		$	1,703		$	1,610
Research and development		2,071			2,141			6,131			6,182
Sales, general and administrative		2,289			2,417			7,128			6,934
Total stock-based compensation expense	$	4,968		$	5,107		$	14,962		$	14,726

Schedule Of Fair Value Of Employee Stock Options



	Three-Month Periods Ended September 30,				Nine-Month Periods Ended September 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%		1.3%		2.1%		1.5%
Dividend yield	—		—		—		—

Schedule Of Fair Value Of Employee Stock Purchase Plan



	Three-Month Periods Ended September 30,				Nine-Month Periods Ended September 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	1.1%-1.4%		0.5%-0.8%		0.8%-1.4%		0.5%-0.9%
Dividend yield	—		—		—		—