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INCOME TAXES (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Unrecognized tax benefits balance at January 1, $ 275 $ 284 $ 0
Increases related to current year tax positions 144 239 284
Decreases due to settlements of tax positions (7) (248) 0
Unrecognized tax benefits balance at December 31, $ 412 $ 275 $ 284