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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Revenue
Advertiser concentration
Sep. 30, 2013
Revenue
Advertiser concentration
item
Revenue Recognition        
Term of license 1 year      
Deferred revenue $ 194 $ 210    
Concentrations of credit risk        
Number of advertisers that account for more than 10% revenue       1
Revenue concentration     10.50% 10.70%