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Taxes on Income (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expenses Benefit [Line Items]      
Current income tax expense benefit $ 534 $ 1,023 $ 1,382
Taxes in respect of previous years (52)
Deferred taxes in Israel 63 146 (46)
Income tax expense benefit 597 1,169 1,284
In Israel [Member]      
Income Tax Expenses Benefit [Line Items]      
Current state and local tax expense benefit 491 945 1,283
Outside Israel [Member]      
Income Tax Expenses Benefit [Line Items]      
Current foreign tax expense benefit $ 43 $ 78 $ 99