INCOME TAXES - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Current:
Federal	$ 16	$ 22	$ 86	$ 193
State and local	87	12	195	43
Foreign	(17)	(3)	143	47
Total current provision	86	31	424	283
Deferred:
Federal	0	419	(1,760)	1,096
State and local	0	62	(639)	162
Foreign	918	39	1,133	39
Total deferred (benefit) provision	918	520	(1,266)	1,297
Total (benefit) provision for income taxes	$ 1,004	$ 551	$ (842)	$ 1,580