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Acquisitions (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Jul. 14, 2016
Mar. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Goodwill $ 2,747 $ 2,734   $ 1,531 $ 1,476
MediaMiser [Member]          
Business Acquisition [Line Items]          
Accounts receivable     $ 771    
Total identifiable assets acquired     5,685    
Accrued salaries, wages and related benefits     63    
Deferred revenues     2,560    
Income and other taxes     97    
Total liabilities assumed     2,720    
Net identifiable assets acquired     2,965    
Goodwill     1,263    
Net assets acquired     4,228    
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