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Acquisitions (Details) - USD ($)
Apr. 12, 2017
Apr. 04, 2017
Oct. 01, 2017
ViDi Systems S.A.      
Business Acquisition [Line Items]      
Total purchase price   $ 23,015,000  
Cash payment   20,019,000  
Holdback to secure potential claims under agreement   $ 2,996,000  
Holdback limitation period   18 months  
tax deductible goodwill   $ 5,112,000  
ViDi Systems S.A. | Completed technologies      
Business Acquisition [Line Items]      
Amortization period   6 years  
ViDi Systems S.A. | Non-compete agreement      
Business Acquisition [Line Items]      
Amortization period   3 years  
GVi Ventures, Inc.      
Business Acquisition [Line Items]      
Total purchase price $ 5,368,000    
Cash payment 4,069,000    
Contingent consideration liabilities 1,299,000   $ 1,477,000
Contingent consideration, low range 0    
Contingent consideration, high range $ 3,500,000    
Contingent consideration, period of recognition (in years) 5 years    
Contingent consideration, current     311,000
Contingent consideration, noncurrent     $ 1,166,000
GVi Ventures, Inc. | Completed technologies      
Business Acquisition [Line Items]      
Amortization period 5 years    
GVi Ventures, Inc. | Customer relationships      
Business Acquisition [Line Items]      
Amortization period 8 years