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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair value measurements |
Summary of financial assets and liabilities measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2023
​ | ​ | Active market | ​ | Observable | ​ | Non-observable | ​ | ​
​ | ​ | (Level 1) | ​ | input (Level 2) | ​ | input (Level 3) | ​ | Total
​ |  | RMB |  | RMB |  | RMB |  | RMB
Assets: | ​ |  | ​ |  | ​ |  |  |
Short-term investments | ​ | 612,857,046 | ​ | 30,036,494 | ​ | — |  | 642,893,540
Long-term investments without readily determinable fair value using NAV practical expedient1 | ​ | — | ​ | — | ​ | — |  | 14,445,946
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative instruments | ​ | — | ​ | 312,870,238 | ​ | — |  | 312,870,238
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2024
​ | ​ | Active market | ​ | Observable | ​ | Non-observable | ​ | ​
​ | ​ | (Level 1) | ​ | input (Level 2) | ​ | input (Level 3) | ​ | Total
​ |  | RMB |  | RMB |  | RMB |  | RMB
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments |  | 1,091,582,140 |  | 26,965,315 |  | — |  | 1,118,547,455
Long-term investments without readily determinable fair value using NAV practical expedient1 |  | — |  | — |  | — |  | 15,163,357
Liabilities: |  | ​ |  |  |  |  |  |
Derivative instruments |  | — |  | 89,894,630 |  | — |  | 89,894,630
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2024
​ | ​ | Active market | ​ | Observable | ​ | Non-observable | ​ | ​
​ | ​ | (Level 1) | ​ | input (Level 2) | ​ | input (Level 3) | ​ | Total
​ |  | US$ |  | US$ |  | US$ |  | US$
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments |  | 149,546,140 |  | 3,694,233 |  | — |  | 153,240,373
Long-term investments without readily determinable fair value using NAV practical expedient1 |  | — |  | — |  | — |  | 2,077,371
Liabilities: |  |  |  |  |  |  |  |
Derivative instruments |  | — |  | 12,315,514 |  | — |  | 12,315,514
1 Investments are measured at fair value using NAV as a practical expedient. These investments have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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