Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

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 assumptions used for the three months ended March 31, 2017 are as follows:

Exercise price	$0.83-$0.87
Expected dividends	0%
Expected volatility	89.93%-91.82%
Risk free interest rate	1.67%-1.75%
Expected life of option	4.24-4.29 years

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

A summary of stock option activities for the three months ended March 31, 2018 is as follows:

	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
Balance - December 31, 2017		12,564,098	$	1.55	4.60 years	$	1,800
Expired		(264,119)	$	1.57
Forfeited		(111,464)	$	0.78
Balance -March 31, 2018 - outstanding		12,188,515	$	1.55	4.40 years	$	-
Balance - March 31, 2018 - exercisable		8,064,487	$	1.93	3.43 years	$	-
Grant date fair value of options granted - March 31, 2018			$	-
Weighted average grant date fair value - March 31, 2018			$	-
Grant date fair value of options granted - December 31, 2017			$	1,164,732
Weighted average grant date fair value - December 31, 2017			$	0.37