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Condensed financial information of the parent company (Tables) | 12 Months Ended
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Dec. 31, 2024
Condensed financial information of the parent company |
Schedule of condensed financial information of the parent company - condensed balance sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | US$
ASSETS: | ​ | ​ | ​ | ​ | ​ | ​
Current assets: | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents |  | 413,317,806 |  | 305,194,205 |  | 41,811,435
Short-term investments |  | 78,808,890 |  | 698,152,621 |  | 95,646,517
Time and Structured deposits | ​ | — | ​ | 380,047,326 | ​ | 52,066,270
Short-term amounts due from intercompanies |  | 687,538,024 |  | 440,259,744 |  | 60,315,338
Other current assets | ​ | — | ​ | 14,670 | ​ | 2,010
Total current assets |  | 1,179,664,720 |  | 1,823,668,566 |  | 249,841,570
Non-current assets: |  | ​ |  | ​ |  | ​
Investments in subsidiaries, VIEs and VIEs’ subsidiaries |  | 10,520,530,855 |  | 10,211,096,821 |  | 1,398,914,529
Total non-current assets |  | 10,520,530,855 |  | 10,211,096,821 |  | 1,398,914,529
TOTAL ASSETS |  | 11,700,195,575 |  | 12,034,765,387 |  | 1,648,756,099
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | US$
LIABILITIES AND SHAREHOLDERS’ EQUITY: | ​ | ​ | ​ | ​ | ​ | ​
Current liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Short-term borrowings | ​ | — | ​ | 720,000,000 | ​ | 98,639,596
Accrued expenses and other intercompanies | ​ | 8,364,603 | ​ | 19,456,357 | ​ | 2,665,510
Short-term amounts due to related parties | ​ | 3,880,000 | ​ | 3,880,000 | ​ | 531,558
Total current liabilities | ​ | 12,244,603 | ​ | 743,336,357 | ​ | 101,836,664
Non-current liabilities | ​ | ​ | ​ | ​ | ​ | ​
TOTAL LIABILITIES | ​ | 12,244,603 | ​ | 743,336,357 | ​ | 101,836,664
Commitments and contingencies | ​ | ​ | ​ | ​ | ​ | ​
Shareholders’ equity | ​ | ​ | ​ | ​ | ​ | ​
Class A Ordinary shares (US$0.0001 par value; 656,508,828 shares authorized, 201,304,881 shares issued and 137,109,719 shares outstanding, as of December 31, 2023; 656,508,828 shares authorized, 201,304,881 shares issued and 105,198,013 shares outstanding, as of December 31, 2024) | ​ | 132,052 | ​ | 132,052 | ​ | 18,091
Class B Ordinary shares (US$0.0001 par value; 63,491,172 shares authorized, 63,491,172 shares issued and outstanding, as of December 31, 2023 and 2024) | ​ | 43,836 | ​ | 43,836 | ​ | 6,006
Treasury shares | ​ | (899,627,520) | ​ | (1,419,285,878) | ​ | (194,441,368)
Additional paid-in capital | ​ | 4,033,145,746 | ​ | 4,026,668,369 | ​ | 551,651,305
Accumulated other comprehensive loss | ​ | (24,130,903) | ​ | 13,751,495 | ​ | 1,883,947
Retained earnings | ​ | 8,578,387,761 |  | 8,670,119,156 | ​ | 1,187,801,454
Total shareholders’ equity |  | 11,687,950,972 |  | 11,291,429,030 | ​ | 1,546,919,435
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY |  | 11,700,195,575 |  | 12,034,765,387 |  | 1,648,756,099
Schedule of condensed financial information of the parent company - condensed statements of comprehensive income/(loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2022 | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | RMB |  | US$
Share-based compensation expense |  | (24,053,760) |  | (4,935,782) |  | (2,257,795) |  | (309,317)
General and administrative |  | (26,199,820) |  | (19,070,062) |  | (40,780,739) |  | (5,586,938)
Interest and investment income/(loss), net |  | (13,148,315) |  | 104,687,566 |  | 189,674,053 |  | 25,985,239
Other non-interest income |  | 11,548,297 |  | 28,626,092 |  | 24,463,472 |  | 3,351,482
Foreign exchange gain/(loss), net |  | 404,232 |  | (545,948) |  | 20,792,611 |  | 2,848,576
Income from the repurchase of convertible senior notes |  | 10,028,456 |  | — |  | — |  | —
Share of loss in subsidiaries, VIEs and VIEs’ subsidiaries |  | (320,543,213) |  | (69,628,327) |  | (100,160,207) |  | (13,721,893)
Net income before income taxes |  | (361,964,123) |  | 39,133,539 |  | 91,731,395 |  | 12,567,149
Income tax expense |  | — |  | — |  | — |  | —
Net income/(loss) |  | (361,964,123) |  | 39,133,539 |  | 91,731,395 |  | 12,567,149
Other comprehensive income |  | ​ |  | ​ |  | ​ |  | ​
Foreign currency translation adjustment | ​ | 13,036,988 | ​ | 21,829,283 | ​ | 37,882,398 | ​ | 5,189,867
Total comprehensive income/(loss) |  | (348,927,135) |  | 60,962,822 |  | 129,613,793 |  | 17,757,016
Schedule of condensed financial information of the parent company - condensed statements of cash flows | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2022 | ​ | 2023 | ​ | 2024
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
Cash flows from operating activities: |  |  |  |  |  |  |  |
Net income/(loss) |  | (361,964,123) |  | 39,133,539 |  | 91,731,395 |  | 12,567,149
Adjustments to reconcile net income to net cash used in operating activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Share of loss in subsidiaries, VIEs and VIEs’ subsidiaries |  | 320,543,213 |  | 69,628,327 |  | 100,160,207 |  | 13,721,893
Share-based compensation expense |  | 24,053,760 |  | 4,935,782 |  | 2,257,795 |  | 309,317
Income from the repurchase of convertible senior notes |  | (10,028,456) |  | — |  | — |  | —
Accrued interest of convertible senior notes |  | 1,732,915 |  | — |  | — |  | —
Investment loss of short-term Investments |  | 67,907,228 |  | 138,739,373 |  | 1,925,270 |  | 263,761
Foreign exchange loss/(gain) net |  | (404,232) |  | 545,948 |  | (20,792,611) |  | (2,848,576)
Payables to employee |  | 66,077 |  | 405,208 |  | 4,893,049 |  | 670,345
Other payables |  | 2,937,392 |  | 2,935,558 |  | 10,942,366 |  | 1,499,098
Net cash provided by operating activities |  | 44,843,774 |  | 256,323,735 |  | 191,117,471 |  | 26,182,987
Net cash provided by (used in) investing activities | ​ | 908,576,201 | ​ | 29,180,599 | ​ | (523,283,656) | ​ | (71,689,567)
Net cash provided by (used in) financing activities | ​ | (834,990,790) | ​ | (420,660,054) | ​ | 186,843,558 | ​ | 25,597,462
Effect of exchange rate changes on cash and cash equivalents | ​ | (117,327,970) | ​ | (10,899,643) | ​ | 37,199,026 | ​ | 5,096,246
Net increase (decrease) in cash and cash equivalents | ​ | 1,101,215 | ​ | (146,055,363) | ​ | (108,123,601) | ​ | (14,812,872)
Cash and cash equivalents at beginning of the year | ​ | 558,271,954 | ​ | 559,373,169 | ​ | 413,317,806 | ​ | 56,624,307
Cash and cash equivalents at end of the year |  | 559,373,169 |  | 413,317,806 |  | 305,194,205 |  | 41,811,435

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