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Acquisitions - GVi Ventures, Inc. (Details) - USD ($)
12 Months Ended
Apr. 12, 2017
Dec. 09, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Revaluation of contingent consideration     $ (3,000) $ (28,000) $ (463,000)
GVi Ventures, Inc. [Member]          
Business Acquisition [Line Items]          
Purchase price $ 5,368,000        
Cash paid in purchase price 4,069,000   1,000,000    
Contingent consideration liability 1,299,000   1,646,000 1,581,000  
Contingent consideration, low range 0        
Contingent consideration, high range $ 2,500,000        
Milestone recognition period 4 years        
Revaluation of contingent consideration     $ 1,065,000 $ 282,000  
Tax deductible goodwill $ 443,000        
Completed Technologies [Member] | GVi Ventures, Inc. [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful life 5 years        
Customer Relationships [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful life   7 years      
Customer Relationships [Member] | GVi Ventures, Inc. [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful life 8 years