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Short-term investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Short-term investments |
Schedule of short-term Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2023 |  | 2024
​ | ​ | RMB | ​ | RMB |  | US$
Debt securities: | ​ | ​ | ​ | ​ |  |
Wealth management products issued by banks or security/trust companies |  | 350,164,305 |  | 178,821,757 |  | 24,498,480
Equity securities: |  | ​ |  | ​ |  | ​
Marketable equity securities |  | 292,729,235 |  | 939,725,698 |  | 128,741,893
Short-term investments |  | 642,893,540 |  | 1,118,547,455 |  | 153,240,373
​

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