Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

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

Share-based Compensation Arrangement by Share-based Payment Award Options and Warrants Vested and Expected to Vest Outstanding and Exercisable [Table Text Block]

The Black-Scholes assumptions used in the three and six months ended June 30, 2015 and 2014 are as follows:

	Three Months Ended June 30,		Six Months Ended June 30,
	2015	2014	2015	2014
Exercise price	$2.04 - $2.73	$2.52 - $2.91	$1.54 - $2.73	$2.52 - $2.91
Expected dividends	0%	0%	0%	0%
Expected volatility	88% - 128%	106% - 150%	88% - 131%	106% - 150%
Risk free interest rate	1.32% - 2.19%	1.73% - 2.73%	1.32% - 2.19%	1.57% - 2.73%
Expected life of option	5 years - 10 years	5 years - 10 years	5 years - 10 years	5 years - 10 years
Expected forfeitures	0%	0%	0%	0%

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of stock option activities as of June 30, 2015, and for the year ended December 31, 2014, is as follows:

				Weighted
				Average
		Weighted		Remaining	Aggregate
		Average Exercise		Contractual	Intrinsic
	Options	Price		Life	Value
Balance - December 31, 2013	3,909,580	$	1.78	5.59 years	$	785,000
Granted	2,382,500	$	2.36
Exercised	(6,583)	$	0.58
Forfeited	(304,391)	$	1.93
Balance - December 31, 2014	5,981,106	$	2.01	5.80 years	$	685,000
Granted	1,800,000	$	2.00
Exercised	(10,842)	$	0.09
Forfeited	(302,502)	$	1.92
Balance – June 30, 2015 - outstanding	7,467,762	$	2.01	5.79 years	$	6,319,000
Balance – June 30, 2015 - exercisable	4,515,532	$	1.92	5.51 years	$	4,283,000
Grant date fair value of options granted - June 30, 2015		$	3,245,000
Weighted average grant date fair value - June 30, 2015		$	1.80
Grant date fair value of options granted - December 31, 2014		$	4,974,000
Weighted average grant date fair value - December 31, 2014		$	2.09