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STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details) - $ / shares
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jan. 06, 2016
Jul. 07, 2015
Feb. 27, 2015
Jan. 15, 2015
Dec. 31, 2014
Oct. 22, 2014
Oct. 21, 2014
Jan. 24, 2013
Dec. 31, 2012
Feb. 02, 2012
Class of Stock [Line Items]                        
Common stock warrants issued (in shares) 2,933,106 1,208,491                    
Underlying Shares 8,876,166                      
Various Institutional Holders; February 2017                        
Class of Stock [Line Items]                        
Underlying Shares 2,832,069                      
Exercise Price (in dollars per share) $ 4.36                      
Affiliates of Third Security, LLC; February 2017                        
Class of Stock [Line Items]                        
Underlying Shares 430,019                      
Exercise Price (in dollars per share) $ 4.36                      
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 122,433                      
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                      
Various Institutional Holders; January 2021                        
Class of Stock [Line Items]                        
Underlying Shares 1,161,972                      
Exercise Price (in dollars per share) $ 1.21                      
Affiliates of Third Security, LLC; January 2021                        
Class of Stock [Line Items]                        
Underlying Shares 161,026                      
Exercise Price (in dollars per share) $ 1.21                      
Various Institutional Holders; January 2021                        
Class of Stock [Line Items]                        
Underlying Shares 1,720,430                      
Exercise Price (in dollars per share) $ 1.21                      
Private Placement                        
Class of Stock [Line Items]                        
Common stock warrants issued (in shares) 1,073,911 493,711                    
Exercise Price (in dollars per share) $ 4.36   $ 4.39 $ 6.50 $ 7.56 $ 9.59 $ 10.25 $ 10.86 $ 11.73 $ 12.96 $ 15.00 $ 15.00
Offering                        
Class of Stock [Line Items]                        
Common stock warrants issued (in shares) 1,881,456 714,780