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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of annual rates of depreciation
   %
    
Computers and electronic equipment  15 - 33
Office furniture and equipment  6 - 33
Leasehold improvements  At the shorter of the lease period or useful life of the leasehold improvement
Schedule of fair value for options granted
   2017  2016
       
Dividend yield  0%  0%
Expected volatility  46.4%-55.9%  50.7%-59.4%
Risk-free interest  1.6%-2.1%  0.8%-1.4%
Expected life (in years)  3.43-4.76  2.79-4.99