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Financing Income, Net (Tables)
3 Months Ended
Mar. 31, 2018
Other Income and Expenses [Abstract]  
Schedule of Financing Income, Net

    US dollars  
    Three-month period
ended March 31,
 
    2018     2017  
    (unaudited)  
Israeli CPI linkage difference on principal of loans from stockholders     911       1,367  
Exchange rate differences     (13,627 )     (10,474 )
Change in fair value of Warrants with down round protection     77,947       84,099  
Other     (3,216 )     (5,717 )
      62,015       69,275