Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Components of (Expense) Income of Derivative Financial Instruments

The following tabular presentation reflects the components of derivative financial instruments as of December 31:

	2014			2013			2012
Derivative (loss) gain in the accompanying statements of operations is related to the individual derivatives as follows:
Free standing warrants assets, related party		—		$	(51	)	$	(338	)
Free standing warrants liabilities		(13,167	)		172			(5,256	)
	$	(13,167	)	$	121		$	(5,594	)

Summary of Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes the only liability measured at fair value on a recurring basis at December 31:

	2014								2013
Fair Value Measurements Using:	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Liabilities
Derivative liabilities	$	—	$	—	$	—	$	—	$	—	$	4,315	$	—	$	4,315

Reconciliation of Beginning and Ending Balances of Assets and Liabilities Measured at Fair Value Using Significant Observable Inputs

Fair Value Measurements Using Significant Observable Inputs (Level 2)

	Value of Warrants			Number of Warrants
Assets:
Warrant asset as of January 1, 2013	$	50			2,000,000
Decrease due to exercise of warrants		(50	)		(2,000,000	)
Warrant asset as of December 31, 2013	$	—			—
Change in fair value of warrants		—			—
Warrant asset as of December 31, 2014	$	—			—
Liabilities:
Warrant liability as of January 1, 2013	$	4,498			2,009,437
Decrease due to exercise of warrants		(11	)		(10,000	)
Increase in fair value of warrants		(172	)		—
Warrant liability as of December 31, 2013	$	4,315			1,999,437
Decrease due to exercise of warrants		(17,482	)		(1,999,153	)
Increase in fair value of warrants		13,167			—
Warrant liability as of December 31, 2014	$	—			284