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Taxes on Income (Tables)
12 Months Ended
Dec. 31, 2018
Taxes On Income  
Schedule of reconciliation of theoretical tax expense
  Year ended December 31, 
   2018   2017   2016 
   %   U.S. dollars in thousands   %   U.S. dollars in thousands   %   U.S. dollars in thousands 
                         
Loss before taxes on income, as reported in the statement of operations   100    11,747    100    5,312    100    8,920 
Theoretical tax saving on this profit or loss   (23)   (2,702)   (24)   (1,275)   (25)   (2,230)
Increase in taxes resulting from permanent differences - non-deductible expenses   4.5    524    1.6    83    14.1    1,261 
Increase in taxes resulting from tax losses in the reported year for which deferred taxes were not recognized   18.6    2,184    22.5    1,193    10.9    971 
Tax expenses   0.05    6    0.02    1    0.02    2