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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed statements of comprehensive loss (Parenthetical) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Foreign currency translation, net of tax	¥ 0	¥ 0	¥ 0
Parent Company
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Foreign currency translation, net of tax	¥ 0	¥ 0	¥ 0

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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