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Summary of significant accounting policies (Tables)
 12 Months Ended
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