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Research and Development Expenses (Tables)
 12 Months Ended
Dec. 31, 2019
Research and Development Expenses [Abstract]  
Schedule of research and development expenses

    Year ended December 31,  
    2019     2018     2017  
    U.S. dollars in thousands  
                   
Fees related to service providers     35       38       51  
Expenses relating to options to employees and non-employees     -       -       2  
Lab materials     -       -       2  
Other     -       -       (12 )
                         
      35       38       43