SEGMENT REPORTING, Revenue by Geographic Areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 72,788	$ 72,589
Domestic (United States) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	70,719	70,075
Non-domestic (Foreign) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 2,069	$ 2,514