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STOCKHOLDERS' EQUITY (Common Stock) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 14, 2016
shares
Jun. 07, 2016
USD ($)
May 31, 2016
shares
Jan. 06, 2016
USD ($)
$ / shares
shares
Jul. 07, 2015
USD ($)
$ / shares
shares
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
May 31, 2016
shares
Dec. 31, 2011
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Jun. 30, 2016
shares
Dec. 31, 2015
$ / shares
shares
Jan. 20, 2015
USD ($)
Jan. 15, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Oct. 21, 2014
$ / shares
shares
Mar. 05, 2014
$ / shares
shares
Dec. 31, 2012
$ / shares
shares
Class of Stock [Line Items]                                            
Common stock, shares authorized (in shares)                       150,000,000 150,000,000     150,000,000            
Common stock, shares issued (in shares)                       24,139,130 24,139,130     13,915,691            
Private placement, net (in shares)       6,780,179 1,500,000                                  
Share price (in dollars per share) | $ / shares         $ 1.42                                  
Stock issued during period | $                         $ 500,000                  
Issuance of common stock, net | $                         $ 468,000 $ 8,977,000                
Proceeds from issuance of common stock and warrants | $         $ 3,000,000                                  
Preferred stock, shares issued (in shares)                       214,705 214,705     4,029,502            
Preferred stock, par value (in dollars per share) | $ / shares                       $ 0.01 $ 0.01     $ 0.01            
Preferred stock, shares outstanding (in shares)                       214,705 214,705     4,029,502            
Common Stock                                            
Class of Stock [Line Items]                                            
Private placement, net (in shares)                         1,292,722                  
Stock issued during period | $                         $ 12,000                  
Shares issued upon conversion of preferred stock (in shares)                         8,930,717                  
Stock issued during period for services (in shares) 64,153   78,000                                      
Stock issued during period for services | $                       $ 89,000                    
Craig-Hallum Capital Group LLC                                            
Class of Stock [Line Items]                                            
Warrants term       5 years 5 years                                  
Common stock warrant, exercise price (in dollars per share) | $ / shares       $ 1.21 $ 1.66                                  
Payments of stock issuance costs | $       $ 140,000 $ 212,783                                  
Payments of stock issuance costs, percentage of gross offering proceeds       7.00% 7.00%                                  
Payments of stock issuance costs, warrant right to purchase common stock shares       107,527 107,033                                  
Stock issuance costs, reimbursable expenses (not to exceed) | $       $ 50,000 $ 50,000                                  
Proceeds from issuance of warrants | $       50                                    
Convertible notes payable                                            
Class of Stock [Line Items]                                            
Face amount | $       750,000                             $ 750,000      
Series A-1 Convertible Preferred Stock and Warrants                                            
Class of Stock [Line Items]                                            
Proceeds from issuance of convertible preferred stock | $       $ 2,200,000                                    
Price per share of shares issued (in dollars per share) | $ / shares       $ 0.93                                    
Series A-1 Convertible Preferred Stock                                            
Class of Stock [Line Items]                                            
Preferred stock, shares issued (in shares)       2,365,243                                    
Voting rights, number of shares per one vote       1.075269                                    
Number of shares converted                   2,150,538                        
Preferred stock, shares outstanding (in shares)                       214,705 214,705                  
Common Stock                                            
Class of Stock [Line Items]                                            
Shares issued upon conversion of preferred stock (in shares)                   2,150,538                        
Series A Preferred Stock                                            
Class of Stock [Line Items]                                            
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.01                                    
Preferred stock, shares outstanding (in shares)       0                       2,586,205            
Third Security LLC and affiliates                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)               1,097,600                         1,212,665  
Common stock warrant, exercise price (in dollars per share) | $ / shares               $ 12.96                         $ 11.73  
Series A Warrants                                            
Class of Stock [Line Items]                                            
Warrants term         5 years 6 months                                  
Warrants, period exercisable         6 months                                  
Warrant exchange amount | $       $ 941,197                                    
Warrant exercise period not subject to cash payment       90 days                                    
Warrant exchange price threshold (in dollars per share) | $ / shares       $ 0.50                                    
Series A Warrants | Pro Forma                                            
Class of Stock [Line Items]                                            
Share price (in dollars per share) | $ / shares       $ 0.25                                    
Payments for repurchase of warrants | $       $ 470,599                                    
Warrant exchange amount | $       $ 941,197                                    
Series A Warrants | Maximum                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)       1,161,972                                    
Series A Warrant, Cashless Exchange | Maximum                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)       1,882,395                                    
Series A Warrant, Cashless Exchange | Maximum | Pro Forma                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)       1,882,395                                    
Series A-1 Warrant                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)       1,773,929                                    
Common stock warrant, exercise price (in dollars per share) | $ / shares       $ 1.21                                    
Warrants, period exercisable       5 years                                    
Warrant exchange amount | $       $ 1,436,882                                    
Warrant exercise period not subject to cash payment       90 days                                    
Warrant exchange price threshold (in dollars per share) | $ / shares       $ 0.50                                    
Series A-1 Warrant | Pro Forma                                            
Class of Stock [Line Items]                                            
Share price (in dollars per share) | $ / shares       $ 0.25                                    
Payments for repurchase of warrants | $       $ 718,441                                    
Warrant exchange amount | $       $ 1,436,882                                    
Series A-1 Warrant | Maximum                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)       2,873,765                                    
Series A-1 Warrant | Maximum | Pro Forma                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)       2,873,765                                    
Series B Warrants                                            
Class of Stock [Line Items]                                            
Warrants term         5 years 6 months                                  
Common stock warrant, exercise price (in dollars per share) | $ / shares         $ 0.01                                  
Series B Warrants | Maximum                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)         700,000.0                                  
Warrants                                            
Class of Stock [Line Items]                                            
Common stock warrant, exercise price (in dollars per share) | $ / shares         $ 1.66                                  
Warrants | Maximum                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)         1,200,000.0                                  
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 (in shares)                 1,583,333                          
Common stock, sale price per share (in dollars per share) | $ / shares                 $ 12                          
Warrants term                 5 years                          
Common stock warrant, common stock called (in shares)       3,239,827 2,188,177 1,881,396 1,309,785 1,097,600 823,333     3,362,276 3,362,276   3,262,088     1,483,161 1,387,685 1,212,665   948,333
Common stock warrant, exercise price (in dollars per share) | $ / shares       $ 4.39 $ 6.50 $ 7.56 $ 10.86 $ 12.96 $ 15.00     $ 4.23 $ 4.23         $ 9.59 $ 10.25 $ 11.73   $ 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 (not to exceed) | $                 $ 125,000                          
Payments of stock issuance costs, reduction to equity | $                 $ 1,500,000                          
Stock issued during period | $                         $ 543,000                  
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                          
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 (in shares)             730,776                              
Share price (in dollars per share) | $ / shares             $ 3.25                              
Stock issued during period | $             $ 2,400,000                              
2014 Private Placement | Advisor                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)             9,230                              
At the Market Offering                                            
Class of Stock [Line Items]                                            
Issuance of common stock, net | $                       $ 500,000 $ 100,000                  
At the Market Offering | Common Stock                                            
Class of Stock [Line Items]                                            
Private placement, net (in shares)                       1,035,255 1,150,569                  
Aggregate authorized amount under At the Market Offering Agreement | $   $ 3,500,000                                        
At the Market Offering | Craig-Hallum Capital Group LLC | Common Stock                                            
Class of Stock [Line Items]                                            
Payments of stock issuance costs, percentage of gross offering proceeds   3.25%                                        
At the Market Offering | Weighted Average | Common Stock                                            
Class of Stock [Line Items]                                            
Share price (in dollars per share) | $ / shares                       $ 0.42 $ 0.42                  
Offering                                            
Class of Stock [Line Items]                                            
Common stock warrant, common stock called (in shares)               691,655                            
Private placement, net (in shares)               1,383,333                            
Share price (in dollars per share) | $ / shares               $ 6.00                            
Stock issued during period | $               $ 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 (in shares)               500,000                            
Additional Note Private Placement | Convertible notes payable                                            
Class of Stock [Line Items]                                            
Face amount | $                                 $ 925,000          
Additional Note Private Placement | Convertible notes payable | Craig-Hallum Capital Group LLC                                            
Class of Stock [Line Items]                                            
Face amount | $                                   $ 46,250        
Face amount as percentage of proceeds from debt issuance                                   5.00%        
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 (in 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