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Other current assets - Allowance for other current assets (Details)
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Other current assets      
Balance at the beginning of the year ¥ 116,860,992 $ 16,009,890 ¥ 256,349,242
Additions/(reversal) (15,572,138) (2,133,374) 29,879,226
Charge-offs (28,617,809) (3,920,624) (169,367,476)
Balance at the end of the year ¥ 72,671,045 $ 9,955,892 ¥ 116,860,992