Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Stock-Based Compensation

Summary of 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,
	2020		2019		2020		2019
Cost of revenue	$	27	$	30	$	55	$	61
Selling, general and administrative		492		426		984		863
Research and development		122		112		245		202
Total stock-based compensation		641		568		1,284		1,126
Tax effect on stock-based compensation		—		—		—		—
Net effect on net income	$	641	$	568	$	1,284	$	1,126

Summary of stock option activity

The following table summarizes the stock option transactions during the six months ended June 30, 2020 (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, 2020	2,953	$	4.00	5.95	$	3,040
Granted	—		—	—		—
Exercised	(216)		2.38	—		—
Canceled and expired	—		—	—		—
Balance as of June 30, 2020	2,737	$	4.13	5.58	$	3,214
Options vested as of June 30, 2020 and unvested options expected to vest, net of forfeitures	2,715	$	4.13	5.56	$	3,182
Options exercisable as of June 30, 2020	2,057	$	4.08	4.54	$	2,483

Summary of restricted stock awards activity

A summary of activity related to restricted stock awards for the six months ended June 30, 2020 is presented below (in thousands, except per share data):

		Weighted-Average
		Grant Date
Stock Awards	Shares	Share Value
Non-vested as of January 1, 2020	939	$	5.02
Granted	53	$	5.22
Vested	(125)	$	6.02
Forfeited	(12)	$	5.69
Non-vested as of June 30, 2020	855	$	4.88