v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
CNY (¥)
segment
Dec. 31, 2025
USD ($)
segment
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Concentration Risk [Line Items]        
Fair value investments recognized | ¥ ¥ 0   ¥ 0 ¥ 0
Equity method investment, impairment 1,724 $ 247 0 0
Income tax, unrecognized | ¥ ¥ 0   ¥ 0 ¥ 0
Number of operating segments | segment 1 1    
Number of reportable segments | segment 1 1    
Revenue | Customer concentration | Customer A        
Concentration Risk [Line Items]        
Percentage of concentration risk 14.70% 14.70% 33.70% 25.60%
Revenue | Customer concentration | Customer B        
Concentration Risk [Line Items]        
Percentage of concentration risk       28.40%
Revenue | Customer concentration | Customer C        
Concentration Risk [Line Items]        
Percentage of concentration risk 17.10% 17.10% 14.10%  
Revenue | Customer concentration | Customer D        
Concentration Risk [Line Items]        
Percentage of concentration risk 10.00% 10.00%    
Accounts receivables | Customer concentration | Customer A        
Concentration Risk [Line Items]        
Percentage of concentration risk     23.50%  
Accounts receivables | Customer concentration | Customer C        
Concentration Risk [Line Items]        
Percentage of concentration risk 12.50% 12.50% 16.80%  
Accounts receivables | Customer concentration | Customer D        
Concentration Risk [Line Items]        
Percentage of concentration risk 16.30% 16.30% 11.80%