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Disposition of Buyer Platform - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 07, 2017
Jun. 30, 2018
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disposition            
Other income to be recognized related to sale of trade name rights $ 1,000          
Time period for ratable recognition of other income 18 months          
Gain (loss) on sale of discontinued operations, net of tax       $ 0 $ (136) $ 14,626
Discontinued operations disposed of by sale | Buyer Platform            
Disposition            
Gain (loss) on sale of discontinued operations, net of tax     $ 14,924   $ (136) $ 14,626
Discontinued operations disposed of by sale | Buyer Platform | Taptica Ltd            
Disposition            
Total consideration $ 50,000          
Other income recognized as result of title transfer   $ 566        
Tremor Video DSP Trade Name            
Disposition            
Proceeds from sale of right to use trade name (included in total consideration) $ 1,000          
Time period following closing for buyer's right to use trade name 18 months