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PARENT ONLY FINANCIAL INFORMATION - Condensed Statements of Comprehensive Loss (Parenthetical) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Statements of Comprehensive Loss
Foreign currency translation adjustments, tax	¥ 0	¥ 0	¥ 0
Parent Company | Reportable Legal Entities
Condensed Statements of Comprehensive Loss
Foreign currency translation adjustments, tax	¥ 0	¥ 0	¥ 0

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Amount of tax expense (benefit), after 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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