Fair Value (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

			Quoted Prices in Active		Significant		Significant
			Markets for Identical		Other Observable		Other Unobservable
			Items		Inputs		Inputs
Balance at September 30, 2014	Total		(Level 1)		(Level 2)		(Level 3)
Common stock warrant liability	$	15,529,387	$	—	$	—	$	15,529,387

			Quoted Prices in Active		Significant		Significant
			Markets for Identical		Other Observable		Other Unobservable
			Items		Inputs		Inputs
Balance at December 31, 2013	Total		(Level 1)		(Level 2)		(Level 3)
Common stock warrant liability	$	28,829,849	$	—	$	—	$	28,829,849

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

	Fair Value
	Measurement Using
	Significant
Common stock warrant liability	Unobservable Inputs
Beginning of period - January 1, 2014	$	28,829,849
Change in fair value of common stock warrants	58,370,871
Issuance of common stock warrants	11,773,240
Exercise of common stock warrants	(83,444,573		)
Fair value of common stock warrant liability at September 30, 2014	$	15,529,387