v3.26.1
Long-term investments - Additional Information (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2025
USD ($)
Long-term investments            
Cumulative impairment losses ¥ 95,877,250         $ 13,710,264
Goodwill 74,940,264         $ 10,716,315
Impairment losses ¥ 0 ¥ 22,240,082 ¥ 46,771,435      
Jiangxi Ruijing            
Long-term investments            
Payments to acquire cost method investment         ¥ 225,000,000  
Equity interest acquired (in percentage)         15.00%  
Jiangxi Ruijing | Acquired equity interest through nominee arrangement            
Long-term investments            
Equity interest acquired (in percentage)         15.00%  
Private entities            
Long-term investments            
Equity interest acquired (in percentage)       45.00%    
Payments to acquire equity interest       ¥ 315,000,000