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Selling and Marketing Expenses (Tables)
12 Months Ended
Dec. 31, 2018
Selling And Marketing Expenses  
Schedule of selling and marketing expenses

   Year ended December 31 
   2018   2017   2016 
   U.S. dollars in thousands 
Payroll and related expenses   2,801    1,567    695 
Share-based payment   123    573    771 
Professional fees   1,118    823    741 
Marketing   699    490    353 
Other   801    598    332 
    5,542    4,051    2,892