INCOME TAXES - Domestic and Foreign Components of Income Before Tax and Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Domestic and foreign components of income before tax for operations [Abstract]
Domestic	$ (5,942)	$ (4,346)	$ (16,167)
Foreign	(9,342)	(1,362)	(9,922)
LOSS BEFORE INCOME TAXES	(15,284)	(5,708)	(26,089)
Components of the provision for income taxes [Abstract]
Current - Federal	946	(888)	(3,005)
Current - State	91	55	55
Current - Foreign	3,088	1,914	1,557
Current income tax expense (benefit)	4,125	1,081	(1,393)
Deferred - Federal	(393)	0	1,149
Deferred - State	(5)	0	217
Deferred - Foreign	(158)	(284)	(2,091)
Deferred income tax benefit	(556)	(284)	(725)
Income tax provision (benefit)	$ 3,569	$ 797	$ (2,118)