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SIGNIFICANT ACCOUNTING POLICIES - Concentration and risks (Details) - Institution
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Concentration Risk      
Number of financial institutions 5    
Number of customers no no no
Number of suppliers no no no
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution One      
Concentration Risk      
Concentration risk, percentage 16.40%    
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Two      
Concentration Risk      
Concentration risk, percentage 13.30%    
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Three      
Concentration Risk      
Concentration risk, percentage 9.80%    
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Four      
Concentration Risk      
Concentration risk, percentage 9.50%    
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Five      
Concentration Risk      
Concentration risk, percentage 7.20%