XML 22 R21.htm IDEA: XBRL DOCUMENT v3.19.2
Short-Term Bank Deposits (Tables)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of short-term bank deposits

Currency  Interest rate (%)   Deposit amount   Maturity date
As of June 30, 2019
            
U.S. dollars   2.90   $4,000   July 10, 2019
U.S. dollars   3.08   $11,018   August 8, 2019
U.S. dollars   2.55   $1,800   September 12, 2019
U.S. dollars   3.27   $30,000   February 6, 2020
        $46,818