DERIVATIVE INSTRUMENTS, CHANGES IN DERIVATIVE WARRANT LIABILITY (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Changes in Derivative Warrant Liability
Balance at beginning of year	$ 4
Repurchase of warrants	(14)
Balance at end of period	2	$ 4
Derivative with Exercise Price Two | Liability | Warrants.
Changes in Derivative Warrant Liability
Balance at beginning of year	4		$ 1,314
Repurchase of warrants	(14)	(40)
Increase (decrease) in the fair value of warrants	12		(241)
Balance at end of period	$ 2	$ 4	$ 1,073