Fair Value (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of financial assets at fair value on a recurring basis

			Quoted Prices in Active			Significant		Significant
			Markets for Identical			Other Observable		Other Unobservable
				Items		Inputs		Inputs
Balance at March 31, 2013	Total			(Level 1)		(Level 2)		(Level 3)
Common stock warrant liability	$	4,574,655		$	-	$	-	$	4,574,655

			Quoted Prices in Active			Significant		Significant
			Markets for Identical			Other Observable		Other Unobservable
				Items		Inputs		Inputs
Balance at December 31, 2012	Total			(Level 1)		(Level 2)		(Level 3)
Common stock warrant liability	$	475,825		$	-	$	-	$	475,825

Schedule of reconciliations of the beginning and ending balances for assets measured at fair value on a recurring basis using significant unobservable inputs (i.e. Level 3)

	Fair Value
	Measurement Using
	Significant
Common stock warrant liability	Unobservable Inputs
Beginning of period - January 1, 2013	$	475,825
Change in fair value of common stock warrants	2,131,314
Issuance of common stock warrants	2,451,028
Exercise of common stock warrants	(483,512)
Fair value of common stock warrant liability at March 31, 2013	$	4,574,655