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Summary of significant accounting policies (Tables)
12 Months Ended
Dec. 31, 2021
Summary of significant accounting policies  
Schedule of estimated useful lives of property, equipment and software
 
Category
  
Estimated useful lives
Electronic equipment
  
3-5
years
Office equipment
   5 years
Vehicles
  
3-
5
years
Logistics, warehouse and other heavy equipment
  
5-10
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
Domain names and trademarks
  
5-20 years
Customer relationship
   3-10 years
Technology and others
  
2-10
years