Equity Transactions - Additional Information (Details) (USD $)	3 Months Ended		9 Months Ended				0 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 17, 2014	Dec. 31, 2013	Mar. 20, 2014 Deerfield [Member]	Mar. 17, 2014 Deerfield [Member]	Sep. 30, 2014 Deerfield [Member]	Sep. 30, 2014 Deerfield [Member]	Mar. 17, 2014 Maximum [Member] Deerfield [Member]
Class of Warrant or Right [Line Items]
Number of securities called by warrants								6,250,000
Exercise price of warrants							1.39	1.39
Number of securities called by warrants associated with each disbursement borrowing											10,000,000
Number of days following borrowing request to determine exercise price associated with each disbursement borrowing under facility agreement								15 days
Maximum borrowing capacity								$ 50,000,000
Warrants value					5,700,000		4,700,000
Amount of initial draw-down under Facility Agreement							20,000,000
Net Proceeds from Initial Draw Under Facility Agreement							19,500,000
Number of warrants issued							4,000,000
Warrant amount reclassified as debt discount							2,300,000
Warrants issued and outstanding									10,250,000	10,250,000
Other income (expense)	(928,000)	210,000	(1,230,000)	(840,000)					500,000	300,000
Common stock warrant liabilities	$ 10,660,000		$ 10,660,000			$ 0
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Risk-free interest rate	1.90%
Dividend yield	0.00%
Expected volatility	63.00%
Expected life (years)	5 years 6 months