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INCOME TAX - Net operating losses (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating losses carry forwards |  |  |  |
Deferred tax assets | ¥ 146,088 | ¥ 72,931 |  |
Valuation allowance on deferred tax assets | 328,821 | ¥ 205,976 | ¥ 155,852 | ¥ 152,241
Deferred tax assets for net operating losses | 386,999 |  |  |
Valuation allowance on net operating losses carryforwards | ¥ 251,868 |  |  |
PRC enterprise income tax rate | 25.00% | 25.00% | 25.00% |
State administration of taxation, China |  |  |  |
Operating losses carry forwards |  |  |  |
Net operating losses carry forwards | ¥ 1,421,451 |  |  |
Net operating losses carry forwards expire if unused by December 31, 2021 | 42,278 |  |  |
Net operating losses carry forwards expire if unused by December 31, 2022 | 97,573 |  |  |
Net operating losses carry forwards expire if unused by December 31, 2023 | 299,356 |  |  |
Net operating losses carry forwards expire if unused by December 31, 2024 | 375,780 |  |  |
Net operating losses carry forwards expire if unused by December 31, 2025 | ¥ 606,464 |  |  |
PRC enterprise income tax rate | 25.00% |  |  |
Withholding tax for dividends distributed by a PRC-resident enterprise to its non-PRC-resident corporate investor (as a percent) | 10.00% |  |  |

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