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INCOME TAX - Additional Information (Details) - CNY (¥) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2008
Disclosure Of Income Tax Expense Credit [Line Items] |  |  |  |
Net deferred tax liability (asset) | ¥ 0 | ¥ 0 | ¥ 0 |
Deferred tax liabilities further recognition | 4,408,000 | 8,704,000 | 13,360,000 |
Hong Kong |  |  |  |
Disclosure Of Income Tax Expense Credit [Line Items] |  |  |  |
Applicable tax rate | 8.25% | 8.25% | 8.25% |
Dividend withholding tax rate |  |  |  | 5.00%
PRC |  |  |  |
Disclosure Of Income Tax Expense Credit [Line Items] |  |  |  |
Applicable tax rate | 25.00% | 25.00% | 25.00% |
Dividend withholding tax rate |  |  |  | 10.00%
Undistributed earnings | ¥ 88,164,000 | ¥ 174,072,000 | ¥ 267,193,000 |

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