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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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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
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Amount of investment in equity security without readily determinable fair value.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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-Topic 942
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