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MARKETABLE SECURITIES - Gross unrealized gains (losses) on marketable securities (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized Gains $ 1 $ 0
Gross unrealized (Losses) (49) (70)
Municipal Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized Gains 0 0
Gross unrealized (Losses) (39) (70)
Corporate Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized Gains 1 0
Gross unrealized (Losses) $ (10) $ 0