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Acquisitions (Details) - USD ($)
$ in Thousands
Oct. 28, 2015
Dec. 10, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]          
Purchase price allocated to goodwill     $ 25,561 $ 12,242
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        
Contingent consideration     4,942    
Total obligation company must pay as first milestone was acheived $ 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 company must pay as the milestones were partly achieved     $ 1,498