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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
ACCOUNTS RECEIVABLE          
Accounts receivable ¥ 132,831   ¥ 83,848   $ 20,844
Allowance for credit losses (4,932)   (6,473)   (774)
Accounts receivable, net 127,899   77,375   $ 20,070
The rollforward in the allowance for credit losses were as follows:          
Balance at the beginning of the year 6,473 $ 1,016 7,147 ¥ 3,585  
Cumulative effect of adopting ASU 2016-13     597    
Disposal of subsidiary     (60)    
Provisions for the year 1,463 230 1,879 4,510  
Reversal of provisions from prior periods due to subsequent cash collection during the year (983) (154) (1,415) (221)  
Amounts written off during the year (2,021) (318) (1,675) (734)  
Foreign exchange gain or loss       7  
Balance at the end of the year ¥ 4,932 $ 774 ¥ 6,473 ¥ 7,147