Stock Options and Stock-Based Employee Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Common Stock Options Outstanding

Below is a summary of common stock options outstanding at December 31, 2018:

	Authorized Shares		Options Outstanding		Options Vested		Available for Grant
Employee and Director Stock Option Plans:
2004 Stock Option Plan		5,000,000		230,000		230,000		—
2006 Director’s Stock Option Plan		1,100,000		55,000		55,000		—
2012 Incentive Plan		6,300,000		638,823		532,573		—
2018 Omnibus Incentive Plan		6,000,000		—		—		5,875,000
Total		18,400,000		923,823		817,573		5,875,000

Summary of Total Stock-based Compensation Expense Resulting from Stock Options, Restricted Stock, RSUs, Performance RSUs, and Performance Stock

For the twelve months ended December 31, 2018, 2017, and 2016, respectively, the total stock-based compensation expense resulting from stock options, Restricted Stock, RSUs, Performance RSUs, and Performance Stock was recorded to the following line items of our consolidated statements of operations:

	Year Ended December 31,
(In thousands)	2018		2017		2016
Cost of revenue	$	327	$	304	$	186
Research and development expenses		469		374		246
Selling, general and administrative expenses		2,522		2,196		1,351
Stock-based compensation expense	$	3,318	$	2,874	$	1,783

Weighted Average Assumptions Applied in Determining Fair Value of Options Granted

The following weighted average assumptions were applied in determining the fair value of options granted during the respective periods:

	Year Ended December 31,
	2018		2017			2016
Risk-free interest rate		—		2.02	%		1.21	%
Expected option life (years)		—		5.7			5.3
Expected stock price volatility		—		42	%		44	%
Expected dividend yield		—		—			—
Fair value of options granted	$	—	$	2.06		$	1.51

Summary of All Stock Option Transactions

The following is a summary of all stock option transactions for the three years ended December 31, 2018:

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Yrs)
Outstanding at January 1, 2016		1,774,552		$	3.65
Granted at market price		373,187		$	3.70
Cancelled or expired		(63,700	)	$	3.95
Exercised		(123,760	)	$	1.66
Outstanding at December 31, 2016		1,960,279		$	3.78
Granted at market price		30,750		$	4.96
Cancelled or expired		(37,412	)	$	4.71
Exercised		(932,303	)	$	4.51
Outstanding at December 31, 2017		1,021,314		$	3.11
Granted at market price		—		$	0.00
Cancelled or expired		(7,480	)	$	4.04
Exercised		(90,011	)	$	1.83
Outstanding at December 31, 2018		923,823		$	3.23		4.76
Options exercisable at December 31, 2018		817,573		$	3.16		4.43

Summarized Information about Stock Options Outstanding by Range of Exercise Prices

Summarized information about stock options outstanding at December 31, 2018, is as follows:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$2.00 - $3.49		431,813		2.90	$	2.58		431,813	$	2.58
$3.50 - $4.99		492,010		6.40	$	3.80		385,760	$	3.82
		923,823		4.76	$	3.23		817,573	$	3.16

Summary of All Restricted Stock Activity

The following is a summary of all Restricted Stock activity during the three years ended December 31, 2018:

	Restricted Shares			Weighted Average Fair Value
Non-vested restricted stock at January 1, 2016		423,250		$	3.91
Granted at market price		573,461		$	3.75
Vested		(292,469	)	$	3.50
Cancelled		(15,000	)	$	4.11
Non-vested restricted stock at December 31, 2016		689,242		$	3.94
Granted at market price		665,623		$	5.02
Vested		(251,956	)	$	4.00
Cancelled		(20,000	)	$	4.96
Non-vested restricted stock at December 31, 2017		1,082,909		$	4.57
Granted at market price		842,546		$	4.53
Vested		(419,452	)	$	4.44
Cancelled		(151,003	)	$	4.77
Non-vested restricted stock at December 31, 2018		1,355,000		$	4.71

Summary of All Restricted Stock Unit Activity

The following is a summary of all RSU activity during the three years ended December 31, 2018:

	Restricted Stock Units			Weighted Average Fair Value
Non-vested restricted stock units at January 1, 2016		299,500		$	3.79
Granted at market price		38,500		$	3.74
Vested		(179,914	)	$	3.66
Cancelled		—		$	—
Non-vested restricted stock units at December 31, 2016		158,086		$	3.92
Granted at market price		54,500		$	4.96
Vested		(126,167	)	$	4.07
Cancelled		—		$	—
Non-vested restricted stock units at December 31, 2017		86,419		$	4.36
Granted at market price		36,500		$	4.57
Vested		(50,751	)	$	4.18
Cancelled		—		$	—
Non-vested restricted stock units at December 31, 2018		72,168		$	4.59

Summary of All Performance RSU Activity

The following is a summary of all Performance RSU activity during the three years ended December 31, 2018:

	Restricted Stock Units			Weighted Average Fair Value
Non-vested performance RSUs at January 1, 2016		182,500		$	3.88
Granted at market price		22,500		$	3.61
Vested		(97,428	)	$	3.88
Forfeited		(16,741	)	$	3.88
Non-vested performance RSUs at December 31, 2016		90,831		$	3.81
Granted at market price		11,500		$	4.96
Vested		(20,999	)	$	4.08
Forfeited		(41,668	)	$	3.83
Non-vested performance RSUs at December 31, 2017		39,664		$	3.98
Granted at market price		5,500		$	4.04
Vested		(32,665	)	$	3.91
Forfeited		—		$	0.00
Non-vested performance RSUs at December 31, 2018		12,499		$	4.20

Summary of All Performance Stock Activity

The following is a summary of all Performance Stock activity during the three years ended December 31, 2018:

	Restricted Stock Units			Weighted Average Fair Value
Non-vested performance stock at January 1, 2016		—			—
Granted at market price		141,500		$	3.61
Vested		(20,000	)	$	3.61
Forfeited		—			—
Non-vested performance stock at December 31, 2016		121,500		$	3.61
Granted at market price		112,112		$	4.96
Vested		—			—
Forfeited		(40,502	)	$	3.61
Non-vested performance stock at December 31, 2017		193,110		$	4.39
Granted at market price		153,723		$	4.04
Vested		(77,874	)	$	4.26
Forfeited		(13,333	)	$	4.50
Non-vested performance stock at December 31, 2018		255,626		$	4.22