Warrant Liabilities (Tables)

12 Months Ended

Dec. 31, 2014

Warrant Liabilities [Abstract]

Schedule of weighted-average Assumptions

The following reflects the weighted-average assumptions for each of the periods indicated:

	Year Ended December 31,
	2014			2013			2012
Risk-free interest rate		0.46	%		0.13% - 0.58	%		0.25% - 0.45	%
Expected dividend yield		0	%		0	%		0	%
Expected lives		1.59			0.95 – 2.59			1.95 – 3.59
Expected volatility		89.7	%		83.4% - 95.3	%		72.6% - 76.0	%
Number of warrants classified as liabilities		6,371,854			6,984,716			6,984,716
Gain (Loss) on warrant liabilities	$	19,051,239		$	(20,210,094	)	$	2,766,704