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FAIR VALUE MEASUREMENTS - Intangible assets (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Growth rate
Unobservable inputs
Terminal growth rate (as a percent)	3.00%
Minimum | Discount rate
Unobservable inputs
Discount rate (as a percent)	15.00%
Maximum | Discount rate
Unobservable inputs
Discount rate (as a percent)	16.00%
Recurring | Significant Unobservable Inputs (Level 3)
FAIR VALUE MEASUREMENTS [Line Items]
Intangible assets	¥ 177,814	¥ 158,870
Recurring | Significant Unobservable Inputs (Level 3) | Growth rate
Unobservable inputs
Terminal growth rate (as a percent)	3.00%	3.00%
Recurring | Significant Unobservable Inputs (Level 3) | Minimum | Royalty rate
Unobservable inputs
Royalty rate (as a percent)	1.00%	1.00%
Recurring | Significant Unobservable Inputs (Level 3) | Minimum | Discount rate
Unobservable inputs
Discount rate (as a percent)	14.80%	14.80%
Recurring | Significant Unobservable Inputs (Level 3) | Maximum | Royalty rate
Unobservable inputs
Royalty rate (as a percent)	7.00%	5.00%
Recurring | Significant Unobservable Inputs (Level 3) | Maximum | Discount rate
Unobservable inputs
Discount rate (as a percent)	16.00%	16.00%

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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