Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

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):

	ThreeMonthsEnded March31,
	2015		2014

Cost of revenue	$	5	$	5
Selling, general and administrative		225		244
Research and development		44		43
Total stock-based compensation		274		292
Tax effect on stock-based compensation		—		—
Net effect on net income (loss)	$	274	$	292

Summary of stock option activity

The following table summarizes our stock option activities during the three months ended March 31, 2015 (in thousands, except per share data):

Stock Options	Shares			Weighted- average Exercise Price		Weighted- average Remaining Contractual Life (inyears)		Aggregate Intrinsic Value

Balance as of January 1, 2015		3,198		$	3.12		6.95	$	1,247
Granted		—			—
Exercised		(54	)		1.40
Canceled and expired		(29	)		2.74
Balance as of March 31, 2015		3,115		$	3.16		6.72	$	966
Options vested and expected to vest as of March 31, 2015		3,115		$	3.16		6.72	$	966
Options exercisable as of March 31, 2015		1,885		$	3.51		5.35	$	667

Restricted stock awards

A summary of activity related to restricted stock awards for the three months ended March 31, 2015 is presented below (in thousands, except per share data):

Stock Awards	Shares		Weighted-Average GrantDateFairValue
Non-vested as of January 1, 2015		261	$	2.71
Granted		—	$	—
Vested		—	$	—
Non-vested as of March 31, 2015		261	$	2.71