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Acquisitions (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 2,748 $ 1,476 $ 1,506 $ 1,635
MediaMiser [Member]        
Business Acquisition [Line Items]        
Accounts receivable 795      
Total identifiable assets acquired 5,709      
Accounts payable and accrued expenses 176      
Accrued salaries, wages and related benefits 63      
Deferred revenues 2,560      
Income and other taxes 97      
Total liabilities assumed 2,896      
Net identifiable assets acquired 2,813      
Goodwill 1,239      
Net assets acquired 4,052      
MediaMiser [Member] | Developed Technology Rights [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 994      
MediaMiser [Member] | Trademarks and Trade Names [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 310      
MediaMiser [Member] | Database Rights [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 3,610