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FAIR VALUE MEASUREMENTS - DERIVATIVES (Details) - USD ($)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Derivatives    
Exercise Price (in dollars per share) $ 3.16 $ 3.29
Number of Shares 16,958,944 17,205,683
Fair Value $ 16,000  
Non-employee options    
Derivatives    
Exercise Price (in dollars per share) $ 6.39  
Number of Shares 284,600  
Fair Value $ 16,000  
Dividend yield (as a percent) 0.00%  
Expected volatility (as a percent) 89.50%  
Risk-free interest rate (as a percent) 0.04%  
Expected term 3 months