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INCOME TAXES - Principal components of deferred income tax assets and liabilities (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Deferred tax assets: |  |
Net loss carryforward | ¥ 337,214 | ¥ 256,850
Deductible advertising expense | 19,613 | 17,964
Accrued expenses and payroll payable | 10,805 | 12,399
Others | 890 | 88
Valuation allowance | (368,522) | ¥ (287,301)
Tax loss carryforwards | ¥ 1,462,175 |
Statute of limitations period according to the PRC Tax Administration and Collection Law (in years) | 3 years |
Extension period for statute of limitations under special circumstances (in years) | 5 years |
Amount of minimum underpayment of tax liability listed as special circumstance for extension period for statute of limitations | ¥ 100 |

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