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Short-Term Bank Deposit (Tables)
6 Months Ended
Jun. 30, 2018
Short-Term Bank Deposit [Abstract]  
Schedule of short-term deposit

   Interest rate      
 Currency %  Deposit amount  Maturity date
 As of June 30, 2018
            
 U.S. dollars  2.28  $40,000  December 27, 2018