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COMMITMENTS AND CONTINGENCIES - Capital commitments (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
Litigation contingencies
Unpaid legal cost and other related costs in a consolidated class action lawsuit	¥ 5,748
Capital additional purchase commitments
Capital commitments
Capital commitments outstanding not provided for in the financial statements, Contracted for	2,722,084	¥ 3,949,623
Purchase of land use rights
Capital commitments
Capital commitments outstanding not provided for in the financial statements, Contracted for	¥ 4,500	¥ 20,650

X

- Definition

Amount of accrued legal cost and other related costs.

+ References

No definition available.

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- References

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- References

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308

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