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CONVERTIBLE PREFERRED STOCK AND WARRANTS - NARRATIVE (Details) - USD ($)
 12 Months Ended
Dec. 13, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]        
Aggregate gross proceeds from issuance of stock $ 7,000,000      
Preferred stock, shares authorized   10,000,000    
Additional accretion of convertible preferred stock and warrants       $ 221,902
Series A preferred stock   $ 0 $ 0  
Warrant        
Class of Stock [Line Items]        
Expected dividend rate (as a percent)   0.00% 0.00%  
Expected volatility rate (as a percent)   24.359% 82.47%  
Risk free interest rate (as a percent)   1.798% 1.47%  
Expected term (in years)   2 years 2 years 6 months  
Investor Warrant        
Class of Stock [Line Items]        
Number of securities called by warrants 5,250,000      
Warrants, exercise price (in dollars per share) $ 2.387      
Placement Agent Warrant        
Class of Stock [Line Items]        
Number of securities called by warrants 525,000 40,000    
Placement Agent Warrant | Warrant        
Class of Stock [Line Items]        
Fair value of placement agent warrants   $ 20,000 $ 203,000 $ 267,000
Series A Preferred Stock        
Class of Stock [Line Items]        
Aggregate gross proceeds from issuance of stock $ 2,600,000      
Preferred stock, shares authorized   3,500,000    
Payments of stock issuance costs $ 400,000      
Redemption value accretion period (in years) 4 years