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Business Acquisitions - Major Classes of Assets and Liabilities Acquired (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
May 03, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 25,043   $ 14,927
VIEVU, LLC      
Business Acquisition [Line Items]      
Accounts receivable   $ 1,776  
Inventory   2,626  
Prepaid expenses and other assets   362  
Property and equipment   459  
Contract assets   1,472  
Intangible assets   4,510  
Goodwill   10,285  
Accounts payable and accrued liabilities   (3,345)  
Deferred revenue   (543)  
Total purchase price   $ 17,602