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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
ACCOUNTS RECEIVABLE          
Accounts receivable ¥ 83,848   ¥ 80,878   $ 12,850
Allowance for credit losses (6,473)   (7,147)   (992)
Accounts receivable, net 77,375   73,731   $ 11,858
The rollforward in the allowance for credit losses were as follows:          
Balance at the beginning of the year 7,147 $ 1,095 3,585 ¥ 12,969  
Cumulative effect of adopting ASU 2016-13 597 92      
Disposal of subsidiary (60) (9)      
Provisions for the year 1,879 288 4,510 1,303  
Reversal of provisions from prior periods due to subsequent cash collection during the year (1,415) (217) (221) (709)  
Amounts written off during the year (1,675) (257) (734) (9,989)  
Foreign exchange gain or loss 0 0 7 11  
Balance at the end of the year ¥ 6,473 $ 992 ¥ 7,147 ¥ 3,585