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Summary of Significant Accounting Policies - Additional information (Details) | 12 Months Ended |  |  |
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Dec. 31, 2024 CNY (¥) segment $ / ¥ | Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2024 USD ($) $ / ¥ | Dec. 31, 2023 USD ($) | May 31, 2015 CNY (¥)
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Land use right, term | 34 years | 34 years |  |  |  |  |
Allowance for credit loss | ¥ 0 |  | ¥ 0 | ¥ 0 |  |  |
Interest income from held-to maturity investments | 51,034,427 | $ 6,991,688 | 80,693,057 | 19,375,505 |  |  |
Investment income from other short-term investments carried at fair value | 315,013,325 | 43,156,649 | 77,394,955 | 98,965,612 |  |  |
Total notional amount | 267,280,381 |  | 411,567,717 |  | $ 36,617,262 |  |
Unrealized gain on comprehensive income/(loss) | 89,894,630 | $ 12,315,514 | 312,870,238 |  |  |  |
Derivative collateral right to reclaim cash | ¥ 267,280,381 |  | 411,567,717 |  | 36,617,262 |  |
Post default loss rate applicable to senior claim | 45.00% | 45.00% |  |  |  |  |
Post default loss rate applicable to subordinate claims | 75.00% | 75.00% |  |  |  |  |
Account receivables | ¥ 34,275,509 |  | 25,876,818 |  | 4,695,725 |  |
Allowance for account receivables, net | 274,956 |  | 205,489 |  | $ 37,669 | $ 28,152 |
Remaining unsatisfied performance obligations | 0 |  |  |  |  |  |
Defined contribution plan expensed incurred | 19,125,406 | $ 2,620,170 | 14,321,884 | 29,871,441 |  |  |
Advertising costs | 53,979 | 7,395 | 946,664 | 207,905,890 |  |  |
Government grants | 175,519 | 24,046 | 5,483,308 | 19,472,671 |  |  |
VAT incurred | ¥ 52,519,936 | $ 7,195,202 | 26,906,439 | 80,085,288 |  |  |
Operating segment | segment | 1 | 1 |  |  |  |  |
Number of reportable segments | segment | 1 | 1 |  |  |  |  |
Exchange rate | $ / ¥ | 7.2993 |  |  |  | 7.2993 |  |
Deposits in the licensed banks |  |  |  |  |  |  | ¥ 500,000
Revenues | ¥ 216,428,374 | $ 29,650,566 | ¥ 126,338,353 | 577,493,364 |  |  |
Concentration of credit risk | Financial assets | China Merchants Bank Company Limited |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Concentration risk, percentage | 22.00% | 22.00% | 25.00% |  |  |  |
Financial assets | ¥ 1,831 |  | ¥ 2,567 |  | $ 251 |  |
Concentration of credit risk | Financial assets | China Guangfa Bank Co., Ltd |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Concentration risk, percentage |  |  | 9.00% |  |  |  |
Financial assets | $ |  |  |  |  |  | $ 936 |
Customer concentration risk | Revenue benchmark | Customer A |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Concentration risk, percentage | 22.00% | 22.00% |  |  |  |  |
Revenues | ¥ 47,629,353 | $ 6,525,195 |  |  |  |  |
Customer concentration risk | Revenue benchmark | Customer B |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Concentration risk, percentage | 39.00% | 39.00% |  |  |  |  |
Revenues | ¥ 83,463,994 | $ 11,434,520 |  |  |  |  |
Customer concentration risk | Revenue benchmark | Customer C |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Concentration risk, percentage | 10.00% | 10.00% |  |  |  |  |
Revenues | ¥ 22,125,951 | $ 3,031,243 |  |  |  |  |
Customer concentration risk | Revenue benchmark | Customer D |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Concentration risk, percentage | 11.00% | 11.00% |  |  |  |  |
Revenues | ¥ 24,452,405 | $ 3,349,966 |  |  |  |  |
Customer concentration risk | Accounts receivable | Customer A |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Account receivables | ¥ 9,300,571 |  |  |  | 1,274,173 |  |
Concentration risk, percentage | 27.00% | 27.00% |  |  |  |  |
Customer concentration risk | Accounts receivable | Customer B |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Account receivables | ¥ 13,291,323 |  |  |  | 1,820,904 |  |
Concentration risk, percentage | 38.00% | 38.00% |  |  |  |  |
Customer concentration risk | Accounts receivable | Customer C |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Account receivables | ¥ 9,028,752 |  |  |  | 1,236,934 |  |
Concentration risk, percentage | 26.00% | 26.00% |  |  |  |  |
Xiamen Youqi Technology Co., Ltd. and other companies |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Applicable tax rate | 3.00% | 3.00% |  |  |  |  |
Computer software |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Research and development costs capitalized | ¥ 0 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Intangible assets estimated useful lives | P1Y | P1Y |  |  |  |  |
Minimum | Other Subsidiaries |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Applicable tax rate | 6.00% | 6.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Intangible assets estimated useful lives | P10Y | P10Y |  |  |  |  |
Maximum | Other Subsidiaries |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Applicable tax rate | 13.00% | 13.00% |  |  |  |  |
Swap |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Derivative collateral right to reclaim cash | ¥ 267,280,381 |  | ¥ 411,567,717 |  | $ 36,617,262 |  |
CICC, CITIC and GF | Swap |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Prepaid for new contracts to be entered into | ¥ 1,231,339,138 | $ 168,692,770 | 50,143,583 |  |  |  |
CICC, CITIC and GF | LIBOR interest rate |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Debt instrument interest rate during period | 2.80% |  |  |  | 2.80% |  |
CICC, CITIC and GF | SOFR |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Debt instrument interest rate during period | 2.00% |  |  |  | 2.00% |  |
Installment credit services |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Revenue from providing loan facilitation service | ¥ 0 | 0 | 0 | 18,316,858 |  |  |
Revenue from post origination services and other | 0 | 0 | 0 | 492,215 |  |  |
Transaction services |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Revenue from providing loan facilitation service | 0 | 0 | 0 | 110,912,689 |  |  |
Revenue from post origination services and other | ¥ 0 | $ 0 | ¥ 0 | ¥ 2,877,700 |  |  |

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