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Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2017
Computers and software [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful life (Mainly 33)
Office furniture and equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful life (Mainly 6)
Leasehold improvements [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful life Over the shorter of the period of the lease or the life of the assets
Motor vehicles [Member]  
Property, Plant and Equipment [Line Items]  
Annual rates 15.00%
Minimum [Member] | Computers and software [Member]  
Property, Plant and Equipment [Line Items]  
Annual rates 20.00%
Minimum [Member] | Office furniture and equipment [Member]  
Property, Plant and Equipment [Line Items]  
Annual rates 6.00%
Maximum [Member] | Computers and software [Member]  
Property, Plant and Equipment [Line Items]  
Annual rates 33.00%
Maximum [Member] | Office furniture and equipment [Member]  
Property, Plant and Equipment [Line Items]  
Annual rates 15.00%