CONVERTIBLE NOTES DERIVATIVE LIABILITY - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in valuation of embedded derivative liability due to dollar change in stock price	$ 3.4
Decrease in valuation of embedded derivative liability due to dollar change in stock price	3.2
Increase in valuation of embedded derivative liability due to percentage change in interest rates	0.8
Decrease in valuation of embedded derivative liability due to percentage change in interest rates	$ 0.7
Embedded Derivative Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in stock price (in usd per share) | $ / shares	$ 1
Change in interest rates (as a percentage)	1.00%