Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity under Stock-Based Compensation Plans

A summary of activity for the Company’s stock option plans for the six months ended June 30, 2019 follows:

	Number Outstanding			Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)		Average Intrinsic Value
Balance at December 31, 2018		621,602		$	5.87		6.32	$	—
Granted		—			—
Cancelled or Expired		(46,000	)		8.52
Exercised		—			—
Balance at June 30, 2019		575,602		$	5.66		6.32	$	337,790
Vested or expected to vest at     June 30, 2019		575,387		$	5.66		6.32	$	337,627
Exercisable at June 30, 2019		547,823		$	5.72		6.28	$	316,678

Summary Information about Options Outstanding

The following table summarizes information about options outstanding as of June 30, 2019:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$4.36 - $7.20		468,810		6.78	$	4.46		441,031	$	4.46
$7.50 - $11.30		85,198		4.64		9.74		85,198		9.74
$12.00 - $19.70		17,244		3.01		13.60		17,244		13.60
$21.70 - $24.20		4,350		2.18		23.27		4,350		23.27
$4.36 - $24.20		575,602						547,823

Summary of RSU Activity

The following is a summary of RSU activity for the six months ended June 30, 2019:

	Number of RSUs			Weighted Average Fair Value
Unvested at December 31, 2018		1,367,630		$	3.81
Granted		289,500			5.21
Vested		(354,669	)		3.53
Forfeited		(27,582	)		3.98
Unvested at June 30, 2019		1,274,879		$	4.19
Shares vested but not released		171,850		$	5.38

Stock-Based Compensation Expense Related to Stock Options and RSUs

The following table illustrates all employee stock-based compensation expense related to stock options and RSUs included in the condensed consolidated statements of operations for the three and six months ended June 30, 2019 and 2018 (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Cost of revenue	$	34	$	22	$	63	$	41
Research and development		113		136		227		271
Selling and marketing		205		189		385		348
General and administrative		341		301		705		624
Total	$	693	$	648	$	1,380	$	1,284