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Interest and investment income, net - Summary of Interest and Investment Income, Net (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 short-term investments ¥ 125,179,719 $ 17,149,551 ¥ (202,012,339) ¥ (40,405,563)
Realized investment income of short-term investments 191,828,265 26,280,365 300,705,577 154,931,404
Unrealized investment (loss)/income of long-term investments (131,604,073) (18,029,685) 645,974,321 (58,356,978)
Realized investment loss of long-term investments     (659,477,110) (8,550,287)
Investment income of structured deposits 49,039,769 6,718,421 59,394,774 3,815,277
Interest income, net 145,618,456 19,949,647 110,747,398 54,793,874
Income from the repurchase of convertible senior notes       10,028,456
Interest expense of convertible senior notes       (3,439,972)
Interest and investment income, net ¥ 380,062,136 $ 52,068,299 ¥ 255,332,621 ¥ 112,816,211