DERIVATIVE INSTRUMENTS - FAIR VALUE OF WARRANTS (Details) - Warrants	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair value of warrants
Risk-free interest rate (as a percent)	0.90%	0.65%
Expected dividend yield (as a percent)	0.00%	0.00%
Expected term (in years)	2 years 7 months 10 days	3 years 4 months 10 days
Expected volatility (as a percent)	92.67%	100.20%