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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 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	(4,708)		4,708			4.78 – 5.27			5.26
Options exercised	—		(114)			1.16 – 4.55			2.70
Options canceled	439		(439)			1.16 – 11.64			7.34
Balances, March 31, 2017	7,200		26,656		$	1.16 – 16.00		$	6.11



Schedule Of Stock-Based Compensation Expense



	Three-Month Periods Ended March 31,
	2017			2016
Cost of revenue	$	523		$	499
Research and development		2,030			1,910
Sales, general and administrative		2,431			2,172
Total stock-based compensation expense	$	4,984		$	4,581



Schedule Of Fair Value Of Employee Stock Options



	Three-Month Periods Ended March 31,
Stock Option	2017		2016
Expected term in years	6.1		6.1
Expected volatility	70%		70%
Risk-free interest rate	2.1%		1.5%
Dividend yield	—		—




Schedule Of Fair Value Of Employee Stock Purchase Plan



	Three-Month Periods Ended March 31,
ESPP	2017		2016
Expected term in years	0.5-2.0		0.5-2.0
Expected volatility	70%		70%
Risk-free interest rate	0.8%-1.3%		0.5%-0.9%
Dividend yield	—		—



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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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-Publisher FASB
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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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