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INCOME TAX EXPENSE/(CREDIT) - Analysis of the deferred tax balances in the consolidated statements (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INCOME TAX EXPENSE/(CREDIT)
Deferred tax assets	¥ 0	¥ 0
Deferred tax liabilities	0	0
Total	¥ 0	¥ 0	¥ 0	¥ (209)

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- Definition

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

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The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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