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Acquisitions - Webscan, Inc Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 09, 2016
Business Acquisition [Line Items]        
Goodwill $ 113,208 $ 113,208 $ 95,280  
Webscan, Inc. [Member]        
Business Acquisition [Line Items]        
Accounts receivable       $ 504
Inventories       296
Prepaid expenses and other current assets       8
Goodwill       925
Accounts payable       (77)
Purchase price       3,176
Customer Relationships [Member] | Webscan, Inc. [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets       680
Completed Technologies [Member] | Webscan, Inc. [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets       $ 840