Income taxes - Summary of reconciliation of income taxes expenses (Details) |
12 Months Ended | |||
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Dec. 31, 2025
CNY (¥)
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Dec. 31, 2025
USD ($)
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Dec. 31, 2024
CNY (¥)
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Dec. 31, 2023
CNY (¥)
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| Effective Income Tax Rate Reconciliation, Amount | ||||
| Income before income tax | ¥ (739,301,975) | $ (105,718,775) | ¥ (157,537,018) | ¥ (101,474,055) |
| PRC statutory income tax rate | 25.00% | 25.00% | 25.00% | 25.00% |
| Income tax expense at PRC statutory income tax rate | ¥ 184,825,494 | ¥ 39,384,255 | ¥ 25,368,514 | |
| Effect of different tax rates | (97,962,122) | (25,070,403) | ||
| Tax exempted income | (113,208,078) | (198,231) | ||
| Outside basis difference | (215,985,749) | |||
| Expenses not deductible for tax purposes | 13,122,045 | 36,882,867 | ||
| Adjustment on current income tax of the previous periods | (18,394,143) | |||
| Non-deductible guarantee liability: | 93,833,446 | |||
| Write-off of NOL and others | 450,292,380 | 252,778,471 | ||
| Withholding income tax | 23,250,000 | 4,427,205 | ||
| Changes in valuation allowance | (249,072,857) | (91,301,461) | ||
| Total income tax expense/(benefit) | ¥ 30,674,579 | $ 4,386,405 | ¥ 65,805,623 | ¥ 62,340,516 |
| Effective tax rate | 4.10% | 4.10% | 41.80% | 61.40% |
| X | ||||||||||
- Definition Adjustment on current income tax of the previous periods. No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions. No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to withholding income taxes. No definition available.
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- Definition Amount of Income tax reconciliation income tax expense benefit outside basis difference. No definition available.
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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