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FINANCIAL RISK MANAGEMENT - Sensitivity analysis (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of financial risk management [Line Items] |  |  |
Loss before taxation | ¥ 193,062 | ¥ 9,445 | ¥ 418,465
Currency risk [member] |  |  |
Disclosure Of financial risk management [Line Items] |  |  |
Loss before taxation | ¥ 421 | ¥ 414 | ¥ 353

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