Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

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				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Cost of revenue	$	31	$	25	$	92	$	67
Selling, general and administrative		433		361		1,296		1,098
Research and development		119		75		321		227
Total stock-based compensation		583		461		1,709		1,392
Tax effect on stock-based compensation		—		—		—		—
Net effect on net income (loss)	$	583	$	461	$	1,709	$	1,392

Summary of stock option activity

The following table summarizes the stock option transactions during the nine months ended September 30, 2019 (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, 2019	2,654	$	4.09	6.28	$	2,720
Granted	—		—
Exercised	(113)		2.37
Canceled and expired	(18)		4.47
Balance as of September 30, 2019	2,523	$	4.16	5.53	$	1,497
Options vested as of September 30, 2019 and unvested options expected to vest, net of forfeitures	2,510	$	4.15	5.52	$	1,497
Options exercisable as of September 30, 2019	2,019	$	3.72	4.88	$	1,451

Summary of restricted stock awards activity

A summary of activity related to restricted stock awards for the nine months ended September 30, 2019 is presented below (in thousands, except per share data):

		Weighted-Average
		Grant Date
Stock Awards	Shares	Fair Value
Non-vested as of January 1, 2019	633	$	6.85
Granted	142	$	5.14
Vested	(57)	$	8.53
Forfeited	(20)	$	7.16
Non-vested as of September 30, 2019	698	$	6.35