Fair Value Measurements (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2013

Dec. 31, 2012

Schedule of Liabilities Measured at Fair Value

The following table represents the Company's fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis:


	As of June 30, 2013
	Level 1		Level 2		Level 3		Balance
Liabilities
Derivative instruments	$	-	$	-	$	1,848,566	$	1,848,566


	As of December 31, 2012
	Level 1		Level 2		Level 3		Balance
Liabilities
Derivative instruments	$	-	$	-	$	1,295,613	$	1,295,613

	As of December 31, 2012
	Level 1		Level 2		Level 3		Balance
Liabilities
Derivatives instruments	$	-	$	-	$	1,295,613	$	1,295,613


	As of December 31, 2011
	Level 1		Level 2		Level 3		Balance
Liabilities
Derivatives instruments	$	-	$	-	$	1,886,652	$	1,886,652

Summary of Changes in Fair Value of Level 3 Liabilities

The following table sets forth a summary of changes in the fair value of the Company's Level 3 liabilities for the six months ended June 30, 2013:


Description	Balance as of December 31, 2012		Unrealized Losses		Balance as of June 30, 2013
Derivative liabilities related to stock purchase warrants	$	1,295,613	$	552,953	$	1,848,566

The following table sets forth a summary of changes in the fair value of the Company's Level 3 liabilities for the six months ended June 30, 2012:


Description	Balance as of December 31, 2011		Unrealized Losses		Balance as of June 30, 2012
Derivative liabilities related to stock purchase warrants	$	1,886,652	$	167,853	$	2,054,505

The following table sets forth a summary of changes in the fair value of our Level 3 liabilities for the years ended December 31, 2012, 2011 and 2010:


Description	Balance as of December 31, 2011		New Liabilities		Unrealized (Gains)			Balance as of December 31, 2012
Stock purchase warrants	$	1,886,652		-	$	(591,039	)	$	1,295,613


Description	Balance as of December 31, 2010		New Liabilities 2011		Unrealized (Gains)			Balance as of December 31, 2011
Stock purchase warrants	$	8,362,995	$	668,640	$	(7,144,983	)	$	1,886,652


Description	Balance as of December 31, 2009		New Liabilities 2010		Unrealized Losses		Balance as of December 31, 2010
Stock purchase warrants	$	835,299	$	2,070,146	$	5,457,550	$	8,362,995

Schedule of Quantitative Information about Level 3 Fair Value Measurements


Quantitative Information about Level 3 Fair Value Measurements
Fair Value at 6/30/2013	Valuation Technique		Unobservable Inputs
$1,848,566		Black-Scholes option pricing model		Expected term
				Expected dividends
				Anticipated volatility


Quantitative Information about Level 3 Fair Value Measurements
Fair Value at 12/31/2012	Valuation Technique		Unobservable Inputs
$1,295,613		Black-Scholes option pricing model		Expected term
				Expected dividends
				Anticipated volatility