Stock Purchase Warrants (Tables)

9 Months Ended

Sep. 30, 2018

Stock Purchase Warrants [Abstract]

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
	September 31, 2018			December 31, 2017			Issuance Date
Closing stock price	$	2.60		$	17.85		$	31.15
Expected dividends		0	%		0	%		0	%
Expected volatility		80	%		80	%		85	%
Risk free interest rate		2.82	%		1.97	%		1.58	%
Expected life of warrant (years)		2.14			2.90			4.00

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

	September 30, 2018			December 31, 2017			Issuance Date
Closing stock price	$	2.60		$	17.85		$	61.25
Expected dividends		0	%		0	%		0	%
Expected volatility		90	%		80	%		95	%
Risk free interest rate		2.60	%		1.86	%		1.39	%
Expected life of warrant (years)		1.04			1.79			5.00

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 The Warrant Liability [Table Text Block]

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		(4,064	)
Balance at September 30, 2018	$	19

Schedule Of Warrant Activity [Table Text Block]

A summary of warrant activity for the Company for the nine months ended September 30, 2018 is as follows:

	Number of Warrants		Weighted Average Exercise Price
Balance at December 31, 2017		915,138	$	52.50
Granted		714		18.20
Exercised		-		-
Forfeited		-		-
Balance at September 30, 2018		915,852	$	52.48

Schedule Of Warrant Outstanding and Exercisable [Table Text Block]

A summary of all outstanding and exercisable warrants as of September 30, 2018 is as follows:

Exercise Price		Warrants Outstanding		Warrants Exercisable		Weighted Average Remaining Contractual Life (years)
$	18.20		714		714		4.24
$	50.05		714,286		714,286		2.14
$	61.25		200,852		200,852		1.03
$	52.48		915,852		915,852		1.90