Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock option activity under the Company's Plans

Stock option activity under the Company’s Plans for the year ended December 31, 2017 is summarized as follows:

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding at beginning of year		4,660,000		$	1.94
Granted		1,550,000			1.17
Exercised		(880,000	)		0.47
Forfeited or cancelled		(138,334	)		1.94
Expired		—			0.00
Outstanding at end of year		5,191,666		$	1.96		4.94	$	10,178,881
Exercisable at end of year		2,908,330		$	2.44		4.40	$	4,334,327

Schedule of Other Information Pertaining to Stock Option Activity

Other information pertaining to stock option activity during the years ended December 31, 2017, 2016 and 2015 was as follows:

	2017		2016		2015
Weighted–average fair value of granted stock options	$	0.91	$	0.62	$	2.13
Total fair value of vested stock options	$	2,016,992	$	1,634,562	$	1,307,895
Total intrinsic value of exercised stock options	$	2,296,100	$	42,000	$	3,311,599

Summary of Company's Stock Options Outstanding

The following table summarizes information about the Company’s options outstanding at December 31, 2017:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price
$0.47 to $0.85		1,085,000		5.15	$	0.78		550,000		5.09	$	0.79
$0.86 to $1.14		1,516,666		6.00	$	1.13		199,999		5.99	$	1.13
$1.15 to $2.80		1,195,000		4.75	$	2.48		866,665		4.65	$	2.51
$2.81 to $3.23		1,020,000		3.67	$	3.12		1,020,000		3.67	$	3.12
$3.24 to $4.64		375,000		4.06	$	3.93		271,666		3.81	$	3.94
		5,191,666		4.94	$	1.96		2,908,330		4.40	$	2.44

Summary of Stock Options Awards Based on Certain Assumptions

Assumptions used during the years were as follows:

	Year ended December 31,
	2017			2016			2015
Risk free interest rate		1.66% to 2.25	%		0.76% to 2.15	%		1.00% to 2.13	%
Expected term		4 to 7 years			2 to 6 years			3 to 7 years
Expected volatility		104	%		100	%		102	%
Expected dividend yield		—	%		—	%		—	%
Expected forfeiture rate		—	%		—	%		—	%

Summary of Restricted Stock Unit Activity

 Restricted stock unit activity during 2017, 2016, and 2015 was as follows:

	2017					2016					2015
	Number of Restricted Stock Units			Weighted Average Grant Date Fair Value		Number of Restricted Stock Units			Weighted Average Grant Date Fair Value		Number of Restricted Stock Units			Weighted Average Grant Date Fair Value
Nonvested balance at beginning of year		26,667		$	2.83		53,334		$	2.83		80,000		$	2.83
Granted		—			—		—			—		—			—
Vested		(26,667	)		2.83		(26,667	)		2.83		(26,666	)		2.83
Forfeited		—			—		—			—		—			—
Nonvested balance at end of year	$	—		$	—		26,667		$	2.83		53,334		$	2.83