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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable ¥ 144,921   ¥ 189,646   $ 22,274
Allowance for doubtful accounts (12,969)   (57)   (1,993)
Accounts receivable, net 131,952   189,589   $ 20,281
The movement in the allowance for doubtful accounts were as follows:          
Balance at the beginning of the year 57 $ 9 1,781 ¥ 2,281  
Acquisition of CHS 0 0 0 167  
Provisions for the year 14,840 2,281 1,066 2,925  
Reversal of provisions from prior periods due to subsequent cash collection during the year 0 0 0 (749)  
Amounts written off during the year (1,928) (297) (2,790) (2,843)  
Balance at the end of the year ¥ 12,969 $ 1,993 ¥ 57 ¥ 1,781