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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

Stock-Based Compensation [Abstract]

Compensation costs related to stock-based awards

The following table summarizes compensation costs related to our stock-based awards (in thousands):

		Three Months Ended September 30,								Nine Months Ended September 30,
		2014				2013				2014				2013
Cost of revenue		$	4			$	6			$	14			$	17
Selling, general and administrative			227				285				716				860
Research and development			41				43				131				127
Total stock-based compensation			272				334				861				1,004
Tax effect on stock-based compensation			—				—				—				—
Net effect on net income (loss)		$	272			$	334			$	861			$	1,004

Weighted-average assumptions

The fair value of our stock options granted to employees for the three and nine months ended September 30, 2014 was estimated using the following weighted-average assumptions:

		Three Months Ended				Nine Months Ended
		September 30, 2014				September 30, 2014
Expected term (in years)			4.4				4.3
Volatility			62.26	%			63.10	%
Expected dividend			0	%			0	%
Risk-free interest rate			1.86	%			1.88	%

Summary of stock option activity

The following table summarizes the stock option transactions during the nine months ended September 30, 2014 (in thousands, except per share data):

Stock Options		Shares				Weighted- average Exercise Price				Weighted- average Remaining Contractual Life (in years)				Aggregate Intrinsic Value
Balance as of January 1, 2014			2,671			$	3.29				6.71			$	893
Granted			252				2.26
Exercised			(112	)			1.21
Canceled and expired			(73	)			5.18
Balance as of September 30, 2014			2,738			$	3.23				6.72			$	585
Options vested and expected to vest as of September 30, 2014			2,738			$	3.23				6.72			$	585
Options exercisable as of September 30, 2014			1,688			$	3.52				5.44			$	505

Restricted stock awards

A summary of activity related to restricted stock awards for the nine months ended September 30, 2014 is presented below:

Stock Awards		Shares				Weighted-Average Grant Date Fair Value
Non-vested as of January 1, 2014			241,232			$	3.44
Granted			55,044			$	2.18
Vested			(48,420	)		$	4.66
Non-vested as of September 30, 2014			247,856			$	2.92

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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 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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