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PREPAYMENTS AND OTHER CURRENT ASSETS (Narrative) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Prepaid Expenses And Other Current Assets [Line Items]        
Reserve For Unrecoverable Deposits Current ¥ 4,798 $ 737 ¥ 4,798  
Due from Related Parties, Current 25,304 3,889 13,496  
JYADK [Member]        
Prepaid Expenses And Other Current Assets [Line Items]        
Due from Related Parties, Current 13,658 1,967 13,658  
Interest Receivable, Current ¥ 221 $ 34 ¥ 370 $ 53