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PARENT ONLY FINANCIAL INFORMATION - Condensed Statements of Comprehensive Loss (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Statements of Comprehensive Loss
Net loss	¥ (669,214)	¥ (442,083)	¥ (430,268)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of nil tax	(386,951)	86,570	61,434
Comprehensive loss	(1,056,165)	(355,513)	(368,834)
Parent Company | Reportable Legal Entities
Condensed Statements of Comprehensive Loss
Net loss	(666,407)	(442,083)	(430,268)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of nil tax	(386,951)	86,570	61,434
Comprehensive loss	¥ (1,053,358)	¥ (355,513)	¥ (368,834)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and 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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