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DERIVATIVE INSTRUMENTS - FAIR VALUE OF WARRANTS (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair value of warrants    
Risk-free interest rate (as a percent) 0.65% 1.47%
Expected dividend yield (as a percent) 0.00% 0.00%
Expected term (in years) 3 years 4 months 24 days 4 years 4 months 24 days
Expected volatility (as a percent) 100.00% 119.00%