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STOCKHOLDERS' EQUITY (Common Stock) (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 27, 2015
USD ($)
$ / shares
$ / unit
shares
Oct. 22, 2014
USD ($)
$ / shares
shares
Jan. 24, 2013
USD ($)
$ / shares
shares
Feb. 02, 2012
USD ($)
$ / shares
shares
Dec. 31, 2011
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Jan. 20, 2015
USD ($)
Jan. 15, 2015
$ / shares
shares
Oct. 21, 2014
$ / shares
shares
Mar. 05, 2014
$ / shares
shares
Class of Stock [Line Items]                      
Common stock, shares authorized           150,000,000 150,000,000        
Common stock, shares issued           12,328,918 8,084,471        
Common stock warrant, common stock called (in shares) 1,881,396 1,309,785         1,387,685   1,483,161 1,212,665  
Common stock warrant, exercise price (in dollars per share) | $ / shares $ 7.56 $ 10.86         $ 10.25   $ 9.59 $ 11.73  
Share price (in dollars per share) | $ / shares           $ 1.67          
Private placement, net | $           $ 6,209,000 $ 2,361,000        
Convertible Notes Payable                      
Class of Stock [Line Items]                      
Debt instrument, face amount | $             $ 750,000        
Maximum                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares)     1,097,600                
Common stock warrant, exercise price (in dollars per share) | $ / shares     $ 15.00                
Minimum                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares)     948,333                
Common stock warrant, exercise price (in dollars per share) | $ / shares     $ 12.96                
Third Security LLC And Affiliates | Maximum                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares)                     1,212,665
Common stock warrant, exercise price (in dollars per share) | $ / shares                     $ 12.96
Third Security LLC And Affiliates | Minimum                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares)                     1,097,600
Common stock warrant, exercise price (in dollars per share) | $ / shares                     $ 11.73
Private Placement                      
Class of Stock [Line Items]                      
Proceeds from issuance of common stock and convertible notes | $       $ 22,000,000 $ 3,000,000            
Common stock, shares issued       1,583,333              
Common stock, sale price per share (in dollars per share) | $ / shares       $ 12              
Common stock warrants, term       5 years              
Common stock warrant, common stock called (in shares)       823,333              
Common stock warrant, exercise price (in dollars per share) | $ / shares       $ 15.00              
Payments of stock issuance costs | $       $ 1,330,000              
Payments of stock issuance costs, percentage of gross offering proceeds       7.00%              
Payments of stock issuance costs, warrant right to purchase common stock shares       31,666              
Payments of stock issuance costs, warrant right to purchase common stock shares, percentage of shares in offering       2.00%              
Stock issuance costs, reimbursable expenses | $       $ 125,000              
Payments of stock issuance costs, reduction to equity | $       $ 1,500,000              
Private Placement | Third Security LLC And Affiliates                      
Class of Stock [Line Items]                      
Convertible notes, common stock callable (in shares)       250,000              
Convertible notes, warrants callable (in shares)       125,000              
Offering                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares)     691,656                
Private placement, net, shares     1,383,333                
Share price (in dollars per share) | $ / shares     $ 6.00                
Private placement, net | $     $ 8,300,000                
Class of warrant or right, number of securities called by warrants or rights, price per share (in dollars per share) | $ / shares     $ 9.00                
Offering | Affiliates of Third Security, LLC; January 2018                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares)     250,000                
Private placement, net, shares     500,000                
2014 Private Placement                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares)   365,388                  
Common stock warrant, exercise price (in dollars per share) | $ / shares   $ 4.00                  
Private placement, net, shares   730,776                  
Share price (in dollars per share) | $ / shares   $ 3.25                  
Private placement, net | $   $ 2,400,000                  
2014 Private Placement | Advisor                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares)   9,230                  
Additional Note Private Placement | Convertible Notes Payable                      
Class of Stock [Line Items]                      
Debt instrument, face amount | $               $ 925,000      
2015 Offering | Craig-Hallum Capital Group LLC                      
Class of Stock [Line Items]                      
Common stock warrant, common stock called (in shares) 714,780                    
Common stock warrant, exercise price (in dollars per share) | $ / shares $ 2.24                    
Private placement, net, shares 3,573,899                    
Class of warrant or right, number of securities called by each warrant or right (in shares) 0.20                    
Class of warrant or right, purchase price per share, public (in dollars per share) | $ / unit 1.95                    
Class of warrant or right, purchase price per share, underwriter (in dollars per share) | $ / unit 1.8135                    
Proceeds from issuance of common stock and warrants, net | $ $ 6,200,000                    
Class of warrant or right, expiration period 5 years