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Concentrations (Tables) | 9 Months Ended
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Sep. 30, 2012
Concentrations [Abstract] |
Schedules of concentration of risk based on consolidated revenue |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2011 |  |  | 2012 |  |  | 2011 |  |  | 2012 |
Advertiser A |  |  | 30 | % |  |  | 27 | % |  |  | 31 | % |  |  | 26 | %
Schedules of concentration of risk based on accounts receivable |
|  | At December 31, 2011 |  |  | At September 30, 2012 |
Advertiser A |  |  | 37 | % |  |  | 32 | %
Advertiser B |  |  | * |  |  |  | 13 | %

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