v3.26.1
TAXATION - Additional Information - Mainland China (Details)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
TAXATION      
Statutory income tax rate (in percent) 25.00%    
Chinese mainland      
TAXATION      
Statutory income tax rate (in percent) 25.00% 25.00% 25.00%
Withholding tax rate 10.00%    
Chinese mainland | Tianjin Hongen Perfect Future Education Technology Co., Ltd. ("Tianjin Hongen", or the "VIE")      
TAXATION      
Preferential income tax rate as SE 12.50%    
Preferential income tax rate as HNTE 15.00%