FAIR VALUE ACCOUNTING - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 2,279
Warrant liabilities	(6,122)	$ (3,912)
Convertible debentures	(16,514)
Financial instruments fair value	(20,357)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	2,279
Warrant liabilities	(4,663)
Convertible debentures	(16,514)
Financial instruments fair value	(18,898)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0
Warrant liabilities	(1,459)
Convertible debentures	0
Financial instruments fair value	(1,459)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0
Warrant liabilities	0
Convertible debentures	0
Financial instruments fair value	$ 0