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INTANGIBLE ASSETS, NET (Narrative) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	¥ 15,756	$ 2,415	¥ 11,995	¥ 4,161
Acquired Finite Lived Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	15,756	$ 2,415	11,995	4,161
Impairment loss on intangible assets	¥ 0		¥ 2,852	¥ 0

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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