Tax liability limitation threshold.

No definition available.

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- Definition

Threshold percentage holding in foreign invested enterprise.

+ References

No definition available.

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- Definition

With holding tax rate on dividends.

+ References

No definition available.

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- Definition

The percentage of withholding tax rate on dividends for beneficial owner.

+ References

No definition available.

+ Details

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

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- Definition

Amount, after income tax refund received, of cash paid to federal (national) tax jurisdiction for tax on income.

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Income taxes - Additional Information (Details)	12 Months Ended
Income taxes - Additional Information (Details)	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
Income taxes
Tax rate			25.00%	25.00%
Withholding income tax for dividends, which arise from profits of foreign invested enterprises	10.00%
Threshold ownership percentage for reduction in withholding tax rate	25.00%
Income tax expense	¥ 28,408,570	$ 4,062,372	¥ 15,406,551	¥ 1,068,958
Income taxes net of refunds received	28,400,000
Operating loss carry forwards	¥ 1,142,140,290		¥ 1,050,262,051	¥ 2,434,721,831
Minimum
Income taxes
Withholding tax rate is reduced to (for foreign investor qualifies as the beneficial owner)	5.00%
Maximum
Income taxes
Withholding tax rate is reduced to (for foreign investor qualifies as the beneficial owner)	10.00%
Hong Kong
Income taxes
Tax rate	16.50%	16.50%
China
Income taxes
Tax rate	25.00%	25.00%
Tax liability limitation threshold	¥ 100,000