DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 11, 2017	Dec. 31, 2014
Derivative instruments
Derivatives (gain) loss	$ 2,267	$ (593)	$ 10,804
Derivative instruments, fair value	$ 4	1,314
Common Stock
Derivative instruments
Number of shares into which a warrant may be converted	577,548		1,354,523	48,507
Common Stock | Public Offering, May 2014
Derivative instruments
Number of shares into which a warrant may be converted	1,750,156
Warrants
Derivative instruments
Derivative instruments, fair value	$ 4	1,314	$ 1,907		$ 7,224
Warrants | Other Income (Expense)
Derivative instruments
Derivatives (gain) loss	$ 2,267	$ (593)	$ 10,804