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Related Parties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Parties (Textual)      
Accrual amount $ 240 $ 215  
Salary expenses, cash bonus and directors' fee to its related parties in the amount $ 558 $ 596 $ 540