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Principal Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Principal Accounting Policies [Abstract] |
Estimated useful lives of property and equipment |
|  | Estimated Useful Lives
Computers |  | 3 years
Equipment, furniture and motor vehicles |  | 5 years
Leasehold improvements |  | Lesser of lease terms or the estimated useful lives of the assets

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