INCOME TAXES - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Current:
Federal	$ 129	$ 121
State and local	19	53
Foreign	17	21
Total current provision	165	195
Deferred:
Federal	288	4
State and local	42	0
Foreign	0	13
Total deferred provision	330	17
Total provision for income taxes	$ 495	$ 212