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Revenues, Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Subscriptions [Abstract]        
Subscription contracts term     1 year  
Strategic Agreements [Abstract]        
Revenues $ 12,476 $ 14,251 $ 25,924 $ 29,653
Minimum [Member]        
Subscriptions [Abstract]        
Advance advertiser invoicing period     3 months  
Maximum [Member]        
Subscriptions [Abstract]        
Advance advertiser invoicing period     6 months  
Google [Member]        
Strategic Agreements [Abstract]        
Strategic agreement term     2 years  
Strategic agreement term, optional renewal term     1 year  
Revenues 3,041   $ 5,962  
Revenue, Remaining Performance Obligation [Abstract]        
Remaining performance obligation 76   76  
Google [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01        
Revenue, Remaining Performance Obligation [Abstract]        
Remaining performance obligation $ 6,119   $ 6,119  
Remaining performance obligation, satisfaction period 1 year   1 year  
Google [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01        
Revenue, Remaining Performance Obligation [Abstract]        
Remaining performance obligation $ 9,008   $ 9,008  
Remaining performance obligation, satisfaction period 1 year   1 year  
Google [Member] | Maximum [Member]        
Strategic Agreements [Abstract]        
Strategic agreement term     3 years