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DERIVATIVE FINANCIAL INSTRUMENTS - Valuation Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value of common stock (in dollars per share) $ 19.29 $ 12.24
Expected life (in years), represents the weighted average period until next liquidity event   3 months 29 days
Expected volatility   85.00%
Dividend yield 0.00% 0.00%
Minimum    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected life (in years), represents the weighted average period until next liquidity event 2 years 1 month 6 days 3 years 1 month 6 days
Risk-free interest rate 1.11% 1.13%
Expected volatility 75.00%  
Maximum    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected life (in years), represents the weighted average period until next liquidity event 4 years 4 years 10 months 24 days
Risk-free interest rate 1.59% 1.69%
Expected volatility 85.00%  
Warrants | Derivative    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected life (in years), represents the weighted average period until next liquidity event 3 months 18 days 4 months 10 days
Risk-free interest rate 1.39% 1.62%
Expected volatility 85.00% 85.00%
Dividend yield 0.00% 0.00%
Exercise Price (in dollars per share) $ 13.25 $ 12.76