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TAXATION - Composition of income tax expense (Details)	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
TAXATION
Deferred taxation	¥ (35,242,565)	$ (5,109,692)	¥ (178,951,592)	¥ (18,406,747)
Change in valuation allowance	35,242,565	5,109,692	178,951,592	18,406,747
Income tax expense				7,165,097
Domestic tax authority
TAXATION
Current income tax expense	0	0	0	7,165,097
Deferred taxation	(35,242,565)	(5,109,692)	4,915,611	25,905,564
Change in valuation allowance	¥ 35,242,565	$ 5,109,692	(4,915,611)	(25,905,564)
Foreign tax authority
TAXATION
Deferred taxation			(183,867,203)	(44,312,311)
Change in valuation allowance			¥ 183,867,203	¥ 44,312,311

X

- Definition

The amount of current and deferred income tax expense(benefits)

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Income Taxes [Line Items]

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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