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STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details) - $ / shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jul. 07, 2015
Jun. 30, 2015
Feb. 27, 2015
Jan. 15, 2015
Dec. 31, 2014
Oct. 22, 2014
Oct. 21, 2014
Feb. 02, 2012
Class of Stock [Line Items]                    
Common stock warrants issued (in shares) 3,466,841 115,432                
Underlying Shares 6,351,826                  
Exercise Price (in dollars per share)     $ 6.50 $ 7.56 $ 7.56 $ 9.59 $ 10.25 $ 10.86 $ 11.73  
Affiliates of Third Security, LLC; December 2015                    
Class of Stock [Line Items]                    
Underlying Shares 431,027                  
Exercise Price (in dollars per share) $ 6.96                  
Various Institutional Holders; February 2017                    
Class of Stock [Line Items]                    
Underlying Shares 1,899,729                  
Exercise Price (in dollars per share) $ 6.50                  
Affiliates of Third Security, LLC; February 2017                    
Class of Stock [Line Items]                    
Underlying Shares 288,448                  
Exercise Price (in dollars per share) $ 6.50                  
Various Institutional Holders; January 2018                    
Class of Stock [Line Items]                    
Underlying Shares 441,655                  
Exercise Price (in dollars per share) $ 9                  
Affiliates of Third Security, LLC; January 2018                    
Class of Stock [Line Items]                    
Underlying Shares 250,000                  
Exercise Price (in dollars per share) $ 9                  
Various Institutional Holders; April 2020                    
Class of Stock [Line Items]                    
Underlying Shares 374,618                  
Exercise Price (in dollars per share) $ 4.00                  
Various Institutional Holders; February 2020                    
Class of Stock [Line Items]                    
Underlying Shares 714,780                  
Exercise Price (in dollars per share) $ 2.24                  
Various Institutional Holders; December 2020                    
Class of Stock [Line Items]                    
Underlying Shares 1,284,405                  
Exercise Price (in dollars per share) $ 1.66                  
Various Institutional Holders; December 2020                    
Class of Stock [Line Items]                    
Underlying Shares 667,164                  
Exercise Price (in dollars per share) $ 0.01                  
Private Placement                    
Class of Stock [Line Items]                    
Common stock warrants issued (in shares) 800,492                  
Exercise Price (in dollars per share)                   $ 15.00
Offering                    
Class of Stock [Line Items]                    
Common stock warrants issued (in shares) 2,666,349