v3.26.1
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Balance Sheets (Details)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Current assets          
Cash and cash equivalents ¥ 924,738,132 $ 132,235,794 ¥ 630,021,303    
Term deposits 128,235,695 18,337,460 274,351,895    
Restricted cash 210,864,000 30,153,151 216,395,796    
Prepayments and other current assets 343,536,572 49,125,076 267,938,339    
Total current assets 2,359,987,270 337,473,690 2,169,806,471    
Non-current assets          
Total assets 2,950,336,404 421,892,493 2,613,158,167    
Current liabilities          
Accrued expenses and other current liabilities 404,813,611 57,887,575 201,356,008    
Total current liabilities and total liabilities 2,045,405,100 292,489,037 1,681,875,947    
Shareholders' equity:          
Additional paid-in capital 2,016,533,709 288,360,485 1,988,638,160    
Accumulated other comprehensive loss (17,990,674) (2,572,632) (3,129,362)    
Accumulated deficit (1,093,713,031) (156,398,883) (1,054,327,443)    
Total shareholders' equity 904,931,304 129,403,456 931,282,220 ¥ 1,093,616,234 ¥ 1,310,097,877
Total liabilities and shareholders' equity 2,950,336,404 421,892,493 2,613,158,167    
Class A ordinary shares          
Shareholders' equity:          
Ordinary shares 91,796 13,127 90,549    
Class B ordinary shares          
Shareholders' equity:          
Ordinary shares 9,504 $ 1,359 10,316    
Parent | Reportable Legal Entities          
Current assets          
Cash and cash equivalents 48,651,480   40,441,814    
Term deposits     68,289,800    
Restricted cash 210,864,000   215,652,000    
Prepayments and other current assets 10,497,711   13,518,861    
Total current assets 270,013,191   337,902,475    
Non-current assets          
Investment in and amount due from subsidiaries, consolidated VIE and VIE's subsidiaries 642,812,016   600,596,446    
Total assets 912,825,207   938,498,921    
Current liabilities          
Amount due to subsidiaries, consolidated VIE and VIE's subsidiaries 4,529,580   4,632,432    
Accrued expenses and other current liabilities 3,364,323   2,584,269    
Total current liabilities and total liabilities 7,893,903   7,216,701    
Shareholders' equity:          
Additional paid-in capital 2,016,533,709   1,988,638,160    
Accumulated other comprehensive loss (17,990,674)   (3,129,362)    
Accumulated deficit (1,093,713,031)   (1,054,327,443)    
Total shareholders' equity 904,931,304   931,282,220    
Total liabilities and shareholders' equity 912,825,207   938,498,921    
Parent | Reportable Legal Entities | Class A ordinary shares          
Shareholders' equity:          
Ordinary shares 91,796   90,549    
Parent | Reportable Legal Entities | Class B ordinary shares          
Shareholders' equity:          
Ordinary shares ¥ 9,504   ¥ 10,316