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v3.25.1

Income Taxes - Summary of reconciliation of income taxes expenses (Details) | 12 Months Ended
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Effective Income Tax Rate Reconciliation, Amount |  |  |  |
Profit (loss) before income tax | ¥ (157,537,018) | $ (21,582,482) | ¥ (101,474,055) | ¥ 269,623,829
PRC statutory income tax rate | 25.00% | 25.00% | 25.00% | 25.00%
Income tax expense (benefit) at PRC statutory income tax rate | ¥ 39,384,255 | $ 5,395,621 | ¥ 25,368,514 | ¥ (67,405,957)
Effect of different tax rates | (97,962,122) | (13,420,756) | (25,070,403) | 12,944,788
Tax exempted income | (113,208,078) | (15,509,443) | (198,231) |
Outside basis difference |  |  | (215,985,749) | (109,594,486)
Expenses not deductible for tax purposes | 13,122,045 | 1,797,713 | 36,882,867 | 12,666,674
Adjustment on current income tax of the previous periods |  |  | (18,394,143) | (18,081,862)
Non-deductible guarantee liability: |  |  | 93,833,446 |
Write-off of NOL and others | 450,292,380 | 61,689,803 | 252,778,471 |
Withholding income tax | 23,250,000 | 3,185,237 | 4,427,205 |
Changes in valuation allowance | (249,072,857) | (34,122,842) | (91,301,461) | 261,898,970
Income tax expenses | ¥ 65,805,623 | $ 9,015,333 | ¥ 62,340,516 | ¥ 92,428,127

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