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Other current assets - Additional information (Details)	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2024 USD ($)
Other current assets
Impairment of inventory	¥ 0	¥ 240,000
Inventory gross amount	10,674,018	10,383,964	$ 1,462,334
Valuation allowance of inventory	9,179,453
Receivables from individuals	¥ 46,000,000	¥ 76,000,000
Minimum
Other current assets
Interest rates	0.00%
Maximum
Other current assets
Interest rates	5.50%

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The amount of receivables from certain individuals on accounting of borrowings made to them classified as current.

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The average effective interest rate during the reporting period.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount of valuation reserve for inventory.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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