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PRINCIPAL ACCOUNTING POLICIES (Tables) | 12 Months Ended
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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

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