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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
 12 Months Ended
Dec. 31, 2023
CNY (¥)
¥ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
CNY (¥)
¥ / shares
shares
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)        
Revenues ¥ 2,651,757,646 $ 373,492,253 ¥ 3,168,597,334 ¥ 3,704,537,419
Cost of revenues (2,081,010,633) (293,104,217) (2,498,916,443) (2,891,758,188)
Gross profit 570,747,013 80,388,036 669,680,891 812,779,231
Operating expenses:        
Selling and marketing expenses (495,734,694) (69,822,771) (440,408,982) (332,007,462)
Research and development expenses (150,985,739) (21,265,897) (176,478,130) (135,218,399)
General and administrative expenses (including allowance for doubtful accounts of RMB1,272,454, RMB25,044,327 and RMB139,445,017 for the years ended December 31, 2021, 2022 and 2023, respectively) (244,518,817) (34,439,755) (158,460,764) (141,798,910)
Total operating expenses (891,239,250) (125,528,423) (775,347,876) (609,024,771)
Government grants 2,968,735 418,138 16,385,038 48,726,818
Operating income (loss) (317,523,502) (44,722,249) (89,281,947) 252,481,278
Interest expenses (1,423,924) (200,556) (5,715,878) (6,167,805)
Interest income 35,492,190 4,998,970 12,860,216 5,375,969
Investment income 1,426,370 200,900 10,917,736 21,167,575
Income (loss) before income taxes (282,028,866) (39,722,935) (71,219,873) 272,857,017
Income tax (expense) benefit 10,192,884 1,435,638 21,756,944 (47,036,608)
Net income (loss) (271,835,982) (38,287,297) (49,462,929) 225,820,409
Other comprehensive income (loss)        
Foreign currency translation adjustment, net of nil income taxes 7,386,368 1,040,348 37,342,724 (9,657,187)
Unrealized gain on available for sale securities, net income taxes of RMB5,809,288, RMB1,184,686 and RMB3,080 for the year 2021, 2022 and 2023, respectively 17,454 2,458 6,460,896 17,427,865
Less: reclassification adjustment for gain on available for sale securities realized in net income, net income taxes of RMB5,291,894, RMB1,698,460 and RMB64,025 for the year 2021, 2022 and 2023, respectively (362,810) (51,100) (9,219,276) (15,875,681)
Comprehensive income (loss) ¥ (264,794,970) $ (37,295,591) ¥ (14,878,585) ¥ 217,715,406
Net income (loss) per ordinary share        
-Basic | (per share) ¥ (1.73) $ (0.24) ¥ (0.32) ¥ 1.47
-Diluted | (per share) ¥ (1.73) $ (0.24) ¥ (0.32) ¥ 1.41
Weighted average number of ordinary shares and ordinary shares equivalents outstanding used in computing net income (loss) per ordinary share        
-Basic 156,816,105 156,816,105 155,176,922 153,672,358
-Diluted 156,816,105 156,816,105 155,176,922 160,460,976