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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
ACCOUNTS RECEIVABLE          
Accounts receivable $ 11,618   ¥ 90,453   ¥ 80,878
Allowance for doubtful accounts (1,027)   (3,585)   (7,147)
Accounts receivable, net 10,591   86,868   ¥ 73,731
The rollforward in the allowance for doubtful accounts were as follows:          
Balance at the beginning of the year 515 ¥ 3,585 12,969 ¥ 57  
Provisions for the year 648 4,510 1,303 14,840  
Reversal of provisions from prior periods due to subsequent cash collection during the year (32) (221) (709) 0  
Amounts written off during the year (105) (734) (9,989) (1,928)  
Foreign exchange gain or loss 1 7 11 0  
Balance at the end of the year $ 1,027 ¥ 7,147 ¥ 3,585 ¥ 12,969