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Acquisitions (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Jul. 14, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 2,832 $ 2,734   $ 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] | Tradenames and Trademarks [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     310  
MediaMiser [Member] | Media Contact Database [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     $ 3,610