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Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2017
Computers and electronic equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, percentage 15.00%
Computers and electronic equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, percentage 33.00%
Office furniture and equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, percentage 6.00%
Office furniture and equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, percentage 33.00%
Leasehold improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, description
At the shorter of the lease period or useful life of the leasehold improvement.