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, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic and foreign components of income before tax for operations [Abstract]
Domestic	$ 9,399	$ (5,942)	$ (4,346)
Foreign	25,208	(9,342)	(1,362)
Income (loss) before income taxes	34,607	(15,284)	(5,708)
Components of the provision for income taxes [Abstract]
Current – Federal	444	946	(888)
Current – State	371	91	55
Current – Foreign	6,972	3,088	1,914
Current income tax expense	7,787	4,125	1,081
Deferred – Federal	98	(393)	0
Deferred – State	0	(5)	0
Deferred -– Foreign	(3,751)	(158)	(284)
Deferred income tax benefit	(3,653)	(556)	(284)
Income tax provision	$ 4,134	$ 3,569	$ 797