REDEEMABLE NON-CONTROLLING INTEREST (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
REDEEMABLE NON-CONTROLLING INTEREST
Beginning balance	$ 1,376	$ 939
Net income attributable to non-controlling interest	32	127
Accretion attributable to non-controlling interest	(30)	309
Purchase of remaining non-controlling interest	(1,377)
Impact of currency translation	$ (1)	1
Ending balance		$ 1,376