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FAIR VALUE MEASUREMENTS (Schedule of Fair Value Measurements for Each Class of Assets on Nonrecurring Basis) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2019 CNY (¥)
FAIR VALUE MEASUREMENTS [Line Items]
Total loss	¥ (39)	$ (6)	¥ 0
Derivative liability:	5,863
Significant unobservable inputs (Level 3)
FAIR VALUE MEASUREMENTS [Line Items]
Derivative liability:	¥ 5,863

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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