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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Accounting Policies [Abstract] |
Estimated Useful Lives of Property and Equipment | The estimated useful lives of property and equipment are as follows:
Leasehold improvements |  |  | 1 to 3 years |
Advertisement display equipment |  |  | 3 years |
Furniture, fixtures and office equipment |  |  | 3 years |

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