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STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details) - $ / shares
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
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) 1,208,491 115,432            
Underlying Shares 4,093,477              
Exercise Price (in dollars per share)     $ 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 1,633,390              
Exercise Price (in dollars per share) $ 7.56              
Affiliates of Third Security, LLC; February 2017                
Class of Stock [Line Items]                
Underlying Shares 248,006              
Exercise Price (in dollars per share) $ 7.56              
Various Institutional Holders; January 2018                
Class of Stock [Line Items]                
Underlying Shares 441,656              
Exercise Price (in dollars per share) $ 9.00              
Affiliates of Third Security, LLC; January 2018                
Class of Stock [Line Items]                
Underlying Shares 250,000              
Exercise Price (in dollars per share) $ 9.00              
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              
Private Placement                
Class of Stock [Line Items]                
Common stock warrants issued (in shares) 493,711              
Exercise Price (in dollars per share)               $ 15.00
Offering                
Class of Stock [Line Items]                
Common stock warrants issued (in shares) 714,780