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FAIR VALUE MEASUREMENTS (Schedule of Change of Fair Value Measurement) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Change of fair value measurements that are categorized within Level 3  
Total fair value as of January 1, 2017 $ 783
Cash settlements (571)
Revaluation of liability presented at fair value (212)
Total fair value as of December 31, 2017