Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Summary of Stock-Based Compensation Expense by Type

The stock-based compensation expense by type is as follows:

	Three Months Ended March 31,
	2019		2018
Service-based awards	$	580	$	572
Performance-based awards - short-term incentive plan		189		41
Performance-based awards - long-term incentive plan		57		0
Stock option and employee purchase plans		56		55
Total	$	882	$	668

Stock-Based Compensation

Total stock-based compensation is reflected in the condensed consolidated statements of operations as follows:

	Three Months Ended March 31,
	2019		2018
Cost of revenues	$	103	$	88
Research and development		172		138
Sales and marketing		180		131
General and administrative		427		311
Total	$	882	$	668

Summary of Stock Option Activity

A summary of the Company’s stock option activity for the three months ended March 31, 2019 is as follows:

	Options Outstanding			Weighted Average Exercise Price
Outstanding at December 31, 2018		423,534		$	7.15
Options cancelled/expired		(100,262	)		7.16
Outstanding at March 31, 2019		323,272		$	7.14
Exercisable at March 31, 2019		318,541		$	7.16

Information about Stock Options Outstanding Under all Stock Plans

The following table summarizes information about stock options outstanding under all stock option plans:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Contractual Life (Years)		Weighted- Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$ 5.00 - $ 7.15		19,126		2.95	$	6.03		14,416	$	6.15
$ 7.16		195,041		1.03		7.16		195,041		7.16
$ 7.22		93,605		1.01		7.22		93,605		7.22
$ 7.23 - $ 8.32		15,500		1.84		7.83		15,479		7.84
$ 5.00 - $ 8.32		323,272		1.17	$	7.14		318,541	$	7.16

Weighted Average Contractual Life and Intrinsic Value of the Options Outstanding and Options Exercisable

The weighted average contractual life and intrinsic value of options outstanding and options exercisable at March 31, 2019, was the following:

	Weighted Average Contractual Life (years)		Intrinsic Value
Options Outstanding		1.17	$	15
Options Exercisable		1.12	$	9

Calculation of Fair Value of Each Employee Stock Purchase Grant Using Black-Scholes Option-Pricing Model

The Company calculated the fair value of each employee stock purchase grant on the date of grant using the Black-Scholes option-pricing model using the following assumptions:

	Employee Stock Purchase Plan
	2019			2018
Dividend yield		4.1	%		3.2	%
Risk-free interest rate		2.5	%		2.1	%
Expected volatility		34	%		33	%
Expected life (in years)		0.5			0.5

Restricted Stock [Member]

Summary of Service-based Restricted Stock Activity

The following table summarizes service-based restricted stock activity for the three months ended March 31, 2019: 

	Shares			Weighted Average Fair Value
Unvested Restricted Stock Awards - December 31, 2018		838,967		$	6.21
Shares awarded		190,159			5.25
Shares vested		(404,122	)		6.26
Shares cancelled		(2,750	)		6.90
Unvested Restricted Stock Awards - March 31, 2019		622,254		$	5.88

Restricted Stock Units [Member]

Summary of Service-based Restricted Stock Activity

The following table summarizes the restricted stock unit activity during the three months ended March 31, 2019:

	Shares			Weighted Average Fair Value
Unvested Restricted Stock Units - December 31, 2018		18,638		$	5.66
Units awarded		2,700			5.27
Units vested/Shares awarded		(5,721	)		5.67
Unvested Restricted Stock Units - March 31, 2019		15,617		$	5.48