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Short-Term Bank Deposit (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of short-term bank deposit
   December 31, 
   2018   2017 
         
Deposit amount  $-   $40,000 
Interest rate (%)   -    2.28 
Maturity date   -    December 27, 2018