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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of significant accounting policies |
Schedule of estimated useful lives of property, equipment and software |
Category |  | Estimated useful lives
Electronic equipment |  | 3-4 years
Office equipment |  | 5 years
Vehicles |  | 5 years
Logistic and warehouse equipment |  | 5 years
Leasehold improvement |  | Over the shorter of the expected life of leasehold improvements or the lease term
Software |  | 3-5 years
Building |  | 40 years
Building improvement |  | 5-10 years
Schedule of estimated useful lives of intangible assets |
Category |  | Estimated useful lives
Strategic Cooperation |  | 5 years
Non-compete |  | 5-8 years
Technology |  | 2-7 years
Domain names and trademarks |  | 5-20 years
Others |  | 2-10 years

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