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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Jul. 02, 2017
Apr. 12, 2017
Apr. 04, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 115,089     $ 95,280
ViDi Systems S.A.        
Business Acquisition [Line Items]        
Cash     $ 146  
Accounts receivable     425  
Prepaid expenses and other current assets     129  
Property, plant, and equipment     40  
Accounts payable     (98)  
Accrued expenses     (716)  
Deferred income tax liability     388  
Goodwill     18,333  
Purchase price     23,015  
ViDi Systems S.A. | Non-compete agreement        
Business Acquisition [Line Items]        
Intangible assets     370  
ViDi Systems S.A. | Completed technologies        
Business Acquisition [Line Items]        
Intangible assets     $ 4,774  
GVi Ventures, Inc.        
Business Acquisition [Line Items]        
Accounts receivable   $ 423    
Inventories   120    
Prepaid expenses and other current assets   1    
Accounts payable   (152)    
Accrued expenses   (10)    
Goodwill   1,476    
Purchase price   5,368    
GVi Ventures, Inc. | Completed technologies        
Business Acquisition [Line Items]        
Intangible assets   910    
GVi Ventures, Inc. | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets   $ 2,600