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Acquisitions (Details) - USD ($)
$ in Thousands
 1 Months Ended
Oct. 28, 2015
Dec. 10, 2014
Apr. 18, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]            
Purchase price allocated to goodwill       $ 25,561 $ 25,561  
ADI Engineering, Inc. [Member]            
Business Acquisition [Line Items]            
Aggregate purchase price in cash $ 10,000          
Contingent consideration 7,802          
Total purchase price 17,802          
Purchase price allocated to tangible assets 222          
Purchase price allocated to intangibles assets 4,261          
Purchase price allocated to goodwill $ 13,319          
Total obligation the company paid         $ 3,000  
Fiberblaze [Member]            
Business Acquisition [Line Items]            
Aggregate purchase price in cash   $ 10,161        
Contingent consideration   4,683        
Total purchase price   14,844        
Purchase price allocated to tangible assets   2,022        
Purchase price allocated to intangibles assets   1,996        
Purchase price allocated to goodwill   12,242        
Purchase price allocated to liabilities assumed   $ 1,416        
Total obligation the company paid           $ 1,463
Percentage of contingent consideration paid in cash           90.00%
Percentage of contingent consideration paid in options to ordinary shares           10.00%
Options granted     22,795