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Interest and investment income, net - Gain/(loss) on derivative instruments (Details)
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Interest and investment income, net        
Unrealized investment income/(loss) of derivative instruments ¥ 222,975,608 $ 30,547,533 ¥ (149,741,836) ¥ (180,503,919)
Realized investment income/(loss) of derivative instruments (203,518,248) (27,881,886) 303,576,774 110,083,438
Gain/(loss) on derivative instruments ¥ 19,457,360 $ 2,665,647 ¥ 153,834,938 ¥ (70,420,481)