Warrant Liabilities (Tables)

6 Months Ended

Jun. 30, 2013

Warrant Liabilities [Abstract]

Schedule of weighted-average assumptions

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

	Six Months			Ended June 30,
	2013			2012
Risk-free interest rate		0.63	%		0.54	%
Expected dividend yield		0	%		0	%
Expected lives		2.96			3.90
Expected volatility		67.3	%		86.3	%
Warrants classified as liabilities	$	3,133,743		$	19,155,292
Gain (loss) on warrant liabilities	$	838,487		$	(12,416,358	)