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FAIR VALUE MEASUREMENT - Additional information (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
FAIR VALUE MEASUREMENT      
Impairment of acquired intangible assets and long-lived assets ¥ 0 ¥ 53,400,000 ¥ 0
Impairment of goodwill 116,332,000 98,196,000  
Significant other unobservable inputs (Level 3)      
FAIR VALUE MEASUREMENT      
Impairment of goodwill ¥ 116,300,000 ¥ 98,200,000 ¥ 93,400,000