Stock-Based Compensation (Tables)

9 Months Ended

Sep. 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 nine months ended September 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 September 30, 2019		575,602		$	5.66		5.97	$	400,704
Vested or expected to vest at     September 30, 2019		575,602		$	5.66		5.97	$	400,704
Exercisable at September 30, 2019		575,602		$	5.66		5.97	$	400,704

Summary Information about Options Outstanding

The following table summarizes information about options outstanding as of September 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		6.50	$	4.46		468,810	$	4.46
$7.50 - $11.30		85,198		3.91		9.74		85,198		9.74
$12.00 - $19.70		17,244		2.76		13.60		17,244		13.60
$21.70 - $24.20		4,350		1.93		23.27		4,350		23.27
$4.36 - $24.20		575,602						575,602

Summary of RSU Activity

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

	Number of RSUs			Weighted Average Fair Value
Unvested at December 31, 2018		1,367,630		$	3.81
Granted		436,182			5.05
Vested		(505,771	)		3.45
Forfeited		(83,844	)		4.06
Unvested at September 30, 2019		1,214,197		$	4.38
Shares vested but not released		187,395		$	5.32

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 nine months ended September 30, 2019 and 2018 (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Cost of revenue	$	34	$	22	$	97	$	63
Research and development		107		125		334		397
Selling and marketing		193		171		578		519
General and administrative		355		385		1,060		1,008
Total	$	689	$	703	$	2,069	$	1,987