Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

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 nine months ended September 30, 2016 and 2015 are as follows:

	Nine months ended September 30,
	2016	2015
Exercise price	$1.08-$2.66	$1.54-2.73
Expected dividends	0%	0%
Expected volatility	102%-117%	88%-131%
Risk free interest rate	1.40%-1.57%	1.32%-2.19%
Expected life of option	7 years	5 years- 10 years

Schedule Of Share-Based Compensation, Stock Options, Activity [Table Text Block]

A summary of stock option activities as of September 30, 2016, and for the year ended December 31, 2015, is as follows:

	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
Balance - December 31, 2014		5,981,106	$	2.01	5.80 years	$	685,000
Granted		3,781,666	$	2.37
Exercised		(35,008)	$	1.16		$	44,000
Expired		(483,332)	$	2.48
Forfeited		(302,502)	$	1.91
Balance - December 31, 2015		8,941,930	$	2.14	5.67 years	$	2,900,000
Granted		560,000	$	2.02
Exercised		(445,334)	$	1.83		$	137,488
Expired		(288,946)	$	1.98
Forfeited		(254,098)	$	2.29
Balance -September 30, 2016 - outstanding		8,513,552	$	2.15	5.18 years	$	1,140,215
Balance - September 30, 2016 - exercisable		5,444,859	$	2.04	4.47 years	$	1,023,072
Grant date fair value of options granted - September 30, 2016			$	962,000
Weighted average grant date fair value - September 30, 2016			$	1.72
Grant date fair value of options granted - December 31, 2015			$	7,974,000
Weighted average grant date fair value - December 31, 2015			$	2.12