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PRINCIPAL ACCOUNTING POLICIES - Summary Of Expected Allowance For Credit Losses (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for Credit Loss [Abstract] |  |  |
Balance at beginning of year | ¥ 13,089 |  |
Allowance for credit losses | 24,045 | 13,089 |
Write-offs | (24,630) |  |
Balance at end of year | ¥ 12,504 | ¥ 13,089 |

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