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Fair value measurements - Assets and liabilities measured at fair value on a recurring basis (Detail) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | ---
Assets: |  |  |
Short-term investments | ¥ 1,118,547,455 | $ 153,240,373 | ¥ 642,893,540
Liabilities: |  |  |
Derivative instruments | 89,894,630 | 12,315,514 | 312,870,238
Fair value, recurring |  |  |
Assets: |  |  |
Short-term investments | 1,118,547,455 | 153,240,373 | 642,893,540
Long-term investments without readily determinable fair value using NAV practical expedient | 15,163,357 | 2,077,371 | 14,445,946
Liabilities: |  |  |
Derivative instruments | 89,894,630 | 12,315,514 | 312,870,238
Active market (Level 1) | Fair value, recurring |  |  |
Assets: |  |  |
Short-term investments | 1,091,582,140 | 149,546,140 | 612,857,046
Observable input (Level 2) | Fair value, recurring |  |  |
Assets: |  |  |
Short-term investments | 26,965,315 | 3,694,233 | 30,036,494
Liabilities: |  |  |
Derivative instruments | ¥ 89,894,630 | $ 12,315,514 | ¥ 312,870,238

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