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Research and Development Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
Research And Development Expenses  
Schedule of research and development expenses
   Year ended December 31 
   2018   2017   2016 
   U.S. dollars in thousands 
             
Payroll and related expenses   1,632    919    627 
Share-based payment   13    103    88 
Subcontractors   421    377    249 
Other   348    209    121 
    2,414    1,608    1,085