Stock Warrants (Tables)

3 Months Ended

Mar. 31, 2019

Stock Warrants [Abstract]

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

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

	Issuance Date
Closing stock price	$	0.88
Expected dividends		0	%
Expected volatility		90	%
Risk free interest rate		3.01	%
Expected life of warrant (years)		5.00

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

	Series A
	December 31, 2018			December 31, 2017			November 18, 2016
Closing stock price	$	0.56		$	17.85		$	31.15
Expected dividends		0	%		0	%		0	%
Expected volatility		92.5	%		80	%		85	%
Risk free interest rate		2.50	%		1.97	%		1.58	%
Expected life of warrant		1.9 years			2.9 years			4.0 years

	December 31, 2018			December 31, 2017			October 10, 2014
Closing stock price	$	0.56		$	17.85		$	61.25
Expected dividends		0	%		0	%		0	%
Expected volatility		110	%		80	%		95	%
Risk free interest rate		2.60	%		1.86	%		1.39	%
Expected life of warrant		.79 years			1.79 years			5.0 years

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

	Issuance Date
Closing stock price	$	18.55
Expected dividends		0	%
Expected volatility		85	%
Risk free interest rate		2.42	%
Expected life of warrant (years)		4.92

Schedule Of Estimated Fair Value Of Warrant Liability

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

Balance at December 31, 2017	$	4,083
Change in fair value of warrant liability		(4,083	)
Balance at December 31, 2018		-
Change in fair value of warrant liability		-
Balance at March 31, 2019	$	-

Schedule Of Warrant Activity [Table Text Block]

A summary of all warrant activity for the Company for the quarter ended March 31, 2019 and the year ended December 31, 2018 is as follows:

	Number of Warrants		Weighted Average Exercise Price
Balance at December 31, 2017		915,138	$	52.50
Granted		18,000,713		1.38
Exercised		-		-
Forfeited		-		-
Balance at December 31, 2018		18,915,851		3.85
Granted		-		-
Exercised		-		-
Forfeited		-		-
Balance at March 31, 2019		18,915,851	$	3.85

Schedule Of Warrant Outstanding and Exercisable [Table Text Block]

A summary of all outstanding and exercisable warrants as of March 31, 2019 is as follows:

Exercise Price		Warrants Outstanding		Warrants Exercisable		Weighted Average Remaining Contractual Life
$	1.38		17,999,999		17,999,999		4.54 years
	18.20		714		714		3.74 years
	50.05		714,286		714,286		1.64 years
	61.25		200,852		200,852		0.53 years
$	3.85		18,915,851		18,915,851		4.38 years