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General and Administrative Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
General And Administrative Expenses  
Schedule of general and administrative expenses
  Year ended December 31 
   2018   2017   2016 
   U.S. dollars in thousands 
             
Payroll and related expenses   667    661    382 
Share-based payment   190    576    902 
Professional fees   885    749    731 
Other   183    164    108 
    1,925    2,150    2,123