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Income Taxes - Summary of current and deferred components of income tax expenses (Details)
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Components of Income Tax Expense (Benefit), Continuing Operations        
Current income tax expense ¥ 65,805,623 $ 9,015,333 ¥ 64,458,408 ¥ 71,567,448
Deferred income tax expense/(benefit)     (2,117,892) 20,860,679
Income tax expenses ¥ 65,805,623 $ 9,015,333 ¥ 62,340,516 ¥ 92,428,127