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SIGNIFICANT ACCOUNTING POLICIES (Property and Equipment Annual Depreciation Rates) (Details)
 12 Months Ended
Dec. 31, 2017
Computers, peripheral equipment and software [Member]  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 33.00%
Computers, peripheral equipment and software [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 15.00%
Computers, peripheral equipment and software [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 33.00%
Office furniture and equipment [Member]  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 15.00%
Office furniture and equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 6.00%
Office furniture and equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 20.00%
Leasehold improvements [Member]  
Property, Plant and Equipment [Line Items]  
Annual depreciation period of property and equipment
Over the shorter of the term of the lease or the useful life of the asset