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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

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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