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Interest and investment income, net - Summary of Interest and Investment Income, Net (Details) | 12 Months Ended
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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

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