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Condensed financial information of the parent company - Condensed statements of cash flows (Details)
 12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Cash flows from operating activities:        
Net income/(loss) ¥ 91,731,395 $ 12,567,149 ¥ 39,133,539 ¥ (361,964,123)
Adjustments to reconcile net income to net cash used in operating activities:        
Share of loss in subsidiaries, VIEs and VIEs' subsidiaries 4,048,792 554,682 (3,207,384) (13,998,022)
Share-based compensation expense 2,257,795 309,317 4,935,782 24,053,760
Income from the repurchase of convertible senior notes       (10,028,456)
Investment loss of short-term Investments (128,094,346) (17,548,853) (13,304,022) 41,288,248
Foreign exchange loss/(gain), net (20,658,172) (2,830,158) 2,931,704 (250,234)
Net cash provided by/(used in) operating activities (111,000,228) (15,206,969) 352,019,561 260,871,457
Net cash (used in)/provided by investing activities (2,344,367,080) (321,176,972) 3,895,444,173 1,884,829,256
Net cash (used in)/provided by financing activities 186,843,558 25,597,463 (565,971,561) (834,990,791)
Effect of exchange rate changes on cash and cash equivalents 46,243,392 6,335,317 12,538,338 18,618,221
Net increase in cash and cash equivalents, and restricted cash and cash equivalents (2,222,280,358) (304,451,161) 3,694,030,511 1,329,328,143
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of the year 7,266,778,502 995,544,573 3,572,747,991 2,243,419,848
Cash and cash equivalents, and restricted cash and cash equivalents at end of the year 5,044,498,144 691,093,412 7,266,778,502 3,572,747,991
Parent Company | Reportable legal entity        
Cash flows from operating activities:        
Net income/(loss) 91,731,395 12,567,149 39,133,539 (361,964,123)
Adjustments to reconcile net income to net cash used in operating activities:        
Share of loss in subsidiaries, VIEs and VIEs' subsidiaries 100,160,207 13,721,893 69,628,327 320,543,213
Share-based compensation expense 2,257,795 309,317 4,935,782 24,053,760
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 1,925,270 263,761 138,739,373 67,907,228
Foreign exchange loss/(gain), net (20,792,611) (2,848,576) 545,948 (404,232)
Payables to employee 4,893,049 670,345 405,208 66,077
Other payables 10,942,366 1,499,098 2,935,558 2,937,392
Net cash provided by/(used in) operating activities 191,117,471 26,182,987 256,323,735 44,843,774
Net cash (used in)/provided by investing activities (523,283,656) (71,689,567) 29,180,599 908,576,201
Net cash (used in)/provided by financing activities 186,843,558 25,597,462 (420,660,054) (834,990,790)
Effect of exchange rate changes on cash and cash equivalents 37,199,026 5,096,246 (10,899,643) (117,327,970)
Net increase in cash and cash equivalents, and restricted cash and cash equivalents (108,123,601) (14,812,872) (146,055,363) 1,101,215
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of the year 413,317,806 56,624,307 559,373,169 558,271,954
Cash and cash equivalents, and restricted cash and cash equivalents at end of the year ¥ 305,194,205 $ 41,811,435 ¥ 413,317,806 ¥ 559,373,169