OTHER ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
OTHER ASSETS [Abstract]
Deferred commission expense - noncurrent	$ 1,867	$ 2,967
Trade receivables - noncurrent	968	1,064
Other, net of allowance for loss on loan receivable of $412 at December 31, 2017 and 2016	1,012	970
Total	3,847	5,001
Allowance for loss on loan receivable	$ 412	$ 412