Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Shareholders' Equity [Abstract]

Weighted-average Assumptions used to Value the Options Granted

We used the following weighted-average assumptions to value the options granted during the years ended December 31, 2017 and 2016, respectively:

	December 31,  2017			December 31, 2016
Expected life, in years		3.00			3.90
Risk-free interest rate		1.45	%		.98	%
Expected volatility		66.89	%		61.86	%
Expected dividend yield		0	%		0	%

Stock Option Activity

The following table summarizes the activity related to our stock options for the years ended December 31, 2017 and 2016, respectively:

	Number of shares			Weighted average exercise price		Weighted average  grant date fair value		Aggregate  intrinsic value		Weighted  average remaining life in years
Balance at December 31, 2015		2,573,640		$	4.46				-		5.24
Options granted		692,400			1.05	$	0.49
Options exercised		-
Options surrendered		(1,585,050	)		3.90
Balance at December 31, 2016		1,680,990		$	3.54			$	752,290		6.55
Options granted		1,042,809			1.65	$	0.74
Options exercised		(7,211	)		1.35			$	13,001
Options surrendered		(170,625	)		4.36
Balance at December 31, 2017		2,545,963		$	2.72			$	3,243,914		6.13
Options exercisable at December 31, 2017		1,031,731		$	4.55			$	705,799		3.39

Restricted Shares Activity

The following table summarizes the activity related to our restricted stock for the years ended December 31, 2017 and 2016, respectively:

	Number of Shares			Weighted average grant date fair value		Weighted average remaining life in years		Aggregate intrinsic value
Balance at December 31, 2015		686,910		$	2.41		1.59	$	886,114
Shares granted		937,858			1.18
Shares vested		(324,521	)		2.19				652,287
Shares surrendered		(307,699	)		2.45
Balance at December 31, 2016		992,548		$	1.30		1.35	$	1,995,021
Shares granted		542,541			1.67
Shares vested		(988,097	)		1.48			$	3,112,506
Shares surrendered		(70,373	)		1.56
Balance at December 31, 2017		476,619		$	1.32		1.93	$	1,501,350