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Business Acquisition (Schedule of Allocation of Purchase Price) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Nov. 30, 2016
Business Acquisition [Line Items]      
Goodwill $ 15,638 $ 15,638  
Placemeter      
Business Acquisition [Line Items]      
Cash and cash equivalents     $ 8
Accounts receivable     11
Prepaid expenses and other current assets     130
Property and equipment     83
Intangibles     6,000
Goodwill     3,742
Accounts payable     (40)
Accrued liabilities     (74)
Deferred tax liabilities     (308)
Total purchase price     $ 9,552