CONTRACT ASSETS (Tables)

6 Months Ended

Jun. 30, 2022

Contract assets [abstract]

Schedule of contract assets

		December 31,			June 30,
		2021			2022			2022
		CNY			CNY			US$
		(Audited)			(Unaudited)			(Unaudited)
Non-current
Service concession assets	(a)		91,062			90,480			13,505
Less: impairment allowance			(27	)		(27	)		(4	)
			91,035			90,453			13,501
Current
Service concession assets	(a)		7,423			7,422			1,108
Other contract assets	(b)		8,443			8,706			1,299
Less: impairment allowance			(535	)		(576	)		(86	)
			15,331			15,552			2,321
Total			106,366			106,005			15,822

Schedule of provision for impairment of contract assets

	Year Ended December 31,		Six Months Ended June 30,
	2021		2022		2022
	CNY		CNY		US$
	(Audited)		(Unaudited)		(Unaudited)
Beginning of the year/period		205		562		84
Provision for expected credit loss, net		357		41		6
End of the year/period		562		603		90