FAIR VALUE MEASUREMENTS - Changes in Level 3 fair value of equity securities (Details) - Equity Securities - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Impairment Effects on Earnings Per Share [Line Items]
Balance at January 1,	¥ 97,372	¥ 228,706	¥ 178,871
Disposal	(15,000)
Change in fair value of warrant liability	(20,372)	(131,334)	49,835
Balance at December 31,	¥ 62,000	¥ 97,372	¥ 228,706

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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