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STOCK-BASED COMPENSATION (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Weighted-average fair value of options granted (per share) $ 2.40 $ 1.33
Intrinsic value gain of options exercised $ 81  
Cash receipts from exercise of options $ 120