Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Stock-based Compensation

Compensation costs related to stock-based awards

The following table summarizes compensation costs related to our stock-based awards (in thousands, except per share data):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Cost of revenue	$	5	$	5	$	10	$	10
Selling, general and administrative		213		417		413		642
Research and development		37		44		85		88
Total stock-based compensation		255		466		508		740
Tax effect on stock-based compensation		—		—		—		—
Net effect on net income (loss)	$	255	$	466	$	508	$	740

Weighted-average assumptions

The fair value of our stock options granted to employees for the three and six months ended June 30, 2016 was estimated using the following weighted-average assumptions:

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2016		2016
Expected term (in years)	—		4.0
Volatility	—	%	49.21	%
Expected dividend	—	%	—	%
Risk-free interest rate	—	%	1.38	%

Summary of stock option activity

The following table summarizes the stock option transactions during the six months ended June 30, 2016 (in thousands, except per share data):

				Weighted-
				average
		Weighted-		Remaining
	Number of	average		Contractual	Aggregate
	Options	Exercise		Life	Intrinsic
Stock Options	Outstanding	Price		(in years)	Value
Balance as of January 1, 2016	3,779	$	2.97	6.26	$	764
Granted	68		2.56
Exercised	(1)		1.59
Canceled and expired	(536)		3.21
Balance as of June 30, 2016	3,310	$	2.92	6.83	$	2,358
Options vested as of June 30, 2016 and unvested options expected to vest, net of forfeitures	3,239	$	2.94	6.78	$	2,292
Options exercisable as of June 30, 2016	1,910	$	3.39	5.39	$	1,096

Restricted stock awards

A summary of activity related to restricted stock awards for the six months ended June 30, 2016 is presented below (in thousands, except per share data):

		Weighted-Average
		Grant Date
Stock Awards	Shares	Fair Value
Non-vested as of January 1, 2016	546	$	2.39
Granted	49	$	3.69
Vested	(37)	$	2.46
Forfeited	(207)	$	2.55
Non-vested as of  June 30, 2016	351	$	2.47