v2.4.0.8
Equity Transactions - Additional Information (Details) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 17, 2014
Dec. 31, 2013
Mar. 20, 2014
Deerfield [Member]
Mar. 17, 2014
Deerfield [Member]
Mar. 31, 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      
Warrant amount reclassified as debt discount         2,300,000      
Number of warrants issued         4,000,000      
Amount of initial draw-down under Facility Agreement         20,000,000      
Net Proceeds from Initial Draw Under Facility Agreement         19,500,000      
Warrants issued and outstanding             10,250,000  
Other income (expense) 383,000 (650,000)         100,000  
Common stock warrant liabilities $ 10,250,000     $ 0        
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]                
Risk-free interest rate 1.90%              
Dividend yield 0.00%              
Expected volatility 74.00%              
Expected life (years) 6 years