Stock-Based Compensation and Warrants (Tables)

12 Months Ended

Dec. 31, 2017

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 years ended December 31, 2017, 2016 and 2015 are as follows:

	Year ended December 31,
	2017			2016			2015
Exercise price	$	0.52 – $0.87		$	0.80 – $2.66		$	1.54 – $2.76
Expected dividends		0	%		0	%		0	%
Expected volatility		83% – 96	%		96% – 123	%		88% – 131	%
Risk free interest rate		1.67% – 2.28	%		1.40% – 2.13	%		1.32% – 2.19	%
Expected life of option		4 – 7 years			7 years			5 years – 10 years

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

A summary of stock option activities for the years ended December 31, 2017, 2016 and 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		3,861,425		0.98
Exercised		(445,334)		1.83			$	137,488
Expired		(338,529)		1.96
Forfeited		(383,265)		2.26
Balance - December 31, 2016		11,636,227		1.77		5.49 years	$	194,355
Granted		3,159,177		0.59
Exercised		(418,773)		0.40			$	163,050
Expired		(667,628)		2.21
Forfeited		(1,144,905)		1.20
Balance -December 31, 2017 - outstanding		12,564,098	$	1.55		4.60 years	$	1,800
Balance - December 31, 2017 - exercisable		7,805,796	$	1.96		3.43 years	$	1,800
Grant date fair value of options granted - December 31, 2017			$	1,164,732
Weighted average grant date fair value - December 31, 2017			$	0.37
Grant date fair value of options granted - December 31, 2016			$	3,091,000
Weighted average grant date fair value - December 31, 2016			$	0.80

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

Options Outstanding								Options Exercisable
Range of Exercise Price		Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life
$	0.09 – $2.00		7,244,099	$	.85		5.28 years		3,082,751	$	1.13		3.41 years
$	2.01 – $3.00		5,319,999		2.49		3.66 years		4,723,045		2.50		3.44 years
$	0.09 – $3.00		12,564,098	$	1.55		4.60 years		7,805,796	$	1.96		3.43 years

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

The assumptions used by the Company are summarized in the following table:

				Series A						Series B
	December 31, 2017			December 31, 2016			Issuance Date			December 31, 2016			Issuance Date
Closing stock price	$	0.51		$	0.76		$	0.89		$	0.76		$	0.89
Expected dividends		0	%		0	%		0	%		0	%		0	%
Expected volatility		80	%		85	%		85	%		90	%		85	%
Risk free interest rate		1.97	%		1.67	%		1.58	%		0.85	%		0.81	%
Expected life of warrant		2.9 years			3.9 years			4.0 years			1.0 years			1.1 years

The assumptions used by the Company are summarized in the following table:

	December 31, 2017			December 31, 2016			Issuance Date
Closing stock price	$	0.51		$	0.76		$	1.75
Expected dividends		0	%		0	%		0	%
Expected volatility		80	%		95	%		95	%
Risk free interest rate		1.86	%		1.41	%		1.39	%
Expected life of warrant		1.79 years			2.79 years			5.0 years

Schedule Of Estimated Fair Value Of The Warrant Liability [Table Text Block]

The following table summarizes the estimated fair value of the warrant liability (in thousands):

Balance at December 31, 2015	$	10,566
Issuance of warrants		15,667
Change in fair value of warrant liability		(11,412)
Balance at December 31, 2016		14,821
Change in fair value of warrant liability		(10,738)
Balance at December 31, 2017	$	4,083

Schedule of Warrant Activity [Table Text Block]

A summary of warrant activity for the Company for the years ended December 31, 2017 and 2016 is as follows:

	Number of Warrants		Weighted Average Exercise Price
Balance at December 31, 2015		7,908,899	$	1.79
Granted		50,000,000		1.58
Exercised		-		-
Forfeited		(567,257)		2.35
Balance at December 31, 2016		57,341,642		1.60
Granted		-		-
Exercised		-		-
Forfeited		(25,311,834)		1.72
Balance at December 31, 2017		32,029,809	$	1.50

Schedule of Warrant Outstanding and Exercisable [Table Text Block]

A summary of all outstanding and exercisable warrants as of December 31, 2017 is as follows:

Exercise Price		Warrants Outstanding		Warrants Exercisable		Weighted Average Remaining Contractual Life
$	1.43		25,000,000		25,000,000		2.88 years
$	1.75		7,029,809		7,029,809		1.78 years
$	1.50		32,029,809		32,029,809		2.64 years