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BUSINESS COMBINATION (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 19, 2018
Dec. 31, 2017
Dec. 31, 2016
BUSINESS COMBINATION        
Intangible assets   $ 3,870    
Goodwill $ 34,938 5,921 $ 29,531 $ 27,522
Assets acquired (net of liabilities assumed)   3,521    
Fair value of net assets acquired   13,312    
Tax deductible amount   $ 0