INCOME TAXES - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Current income tax expense:
U.S. – federal and state	$ 102	$ 242
Foreign	7,276	3,923
Total current income tax expense	7,378	4,165
Deferred income tax benefit:
U.S. – federal and state	0	0
Foreign	(1,322)	(1,472)
Total deferred income tax benefit	(1,322)	(1,472)
Total provision for income taxes	$ 6,056	$ 2,693