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PRINCIPAL ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Summary Of Expected Allowance For Credit Losses
The following table summarized the details of the Company’s allowance for expected credit losses:
 
    
2019
     
2020
     
2021
  
Balance at beginning of year
      —          —          13,089  
Allowance for credit losses
        —        13,089        24,045  
Write-offs
      —          —          (24,630 ) 
    
 
 
     
 
 
     
 
 
  
Balance at end of year
      —          13,089        12,504  
Schedule of useful life of property plant equipment
Property, equipment and software are stated at cost less accumulated depreciation. Property, equipment and software are depreciated at rates sufficient to write off their costs less impairment and residual value, if any, over the estimated useful lives on a straight-line basis. The estimated useful lives are as follow:
 
Category
   
Estimated useful lives
Leasehold improvement    Shorter of the term of the lease or the estimated useful lives of the assets
Electronic equipment    3 years
Furniture    3 years
Software    3 years
Vehicles    3 years