INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
INCOME TAXES [Abstract]
Provision for income taxes	$ 50	$ 50	$ 100	$ 100
Effective income tax rate	1.20%	0.70%	0.90%	0.60%
Federal corporate tax rate	21.00%
Provisional deferred tax expense (benefit)					$ (17,700)