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Interest and investment income, net (Tables) | 12 Months Ended
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Dec. 31, 2024
Interest and investment income, net |
Schedule of interest and investment income, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2022 | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | RMB |  | US$
Unrealized investment income/(loss) of short-term investments |  | (40,405,563) |  | (202,012,339) |  | 125,179,719 |  | 17,149,551
Realized investment income of short-term investments |  | 154,931,404 |  | 300,705,577 |  | 191,828,265 |  | 26,280,365
Unrealized investment (loss)/income of long-term investments |  | (58,356,978) |  | 645,974,321 |  | (131,604,073) |  | (18,029,685)
Realized investment loss of long-term investments | ​ | (8,550,287) | ​ | (659,477,110) | ​ | — | ​ | —
Investment income of structured deposits |  | 3,815,277 |  | 59,394,774 |  | 49,039,769 |  | 6,718,421
Interest income, net |  | 54,793,874 |  | 110,747,398 |  | 145,618,456 |  | 19,949,647
Income from the repurchase of convertible senior notes | ​ | 10,028,456 | ​ | — | ​ | — | ​ | —
Interest expense of convertible senior notes |  | (3,439,972) |  | — |  | — |  | —
​ |  | 112,816,211 |  | 255,332,621 |  | 380,062,136 |  | 52,068,299
Schedule of gain/(loss) on derivative instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ |  | 2022 |  | 2023 |  | 2024
​ | ​ | RMB | ​ | RMB | ​ | RMB |  | US$
Unrealized investment income/(loss) of derivative instruments | ​ | (180,503,919) | ​ | (149,741,836) | ​ | 222,975,608 | ​ | 30,547,533
Realized investment income/(loss) of derivative instruments | ​ | 110,083,438 | ​ | 303,576,774 | ​ | (203,518,248) | ​ | (27,881,886)
​ | ​ | (70,420,481) | ​ | 153,834,938 | ​ | 19,457,360 | ​ | 2,665,647
​

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