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Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Cash (net of working capital adjustment of $862) $ 0 $ 3,375 $ 0
MediaMiser [Member]      
Business Acquisition [Line Items]      
Cash (net of working capital adjustment of $862) 3,225    
Shares of common stock payable by July 28, 2015 587    
Shares of common stock payable by July 28, 2016 697    
Contingent consideration 585    
Business Combination, Consideration Transferred $ 5,094