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PREPAYMENTS AND OTHER CURRENT ASSETS (Narrative) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Prepaid Expenses And Other Current Assets [Line Items]        
Reserve For Unrecoverable Deposits Current ¥ 14,798 $ 2,152 ¥ 4,798  
Due from Related Parties, Current 20,671 887 25,304 $ 0
JYADK [Member]        
Prepaid Expenses And Other Current Assets [Line Items]        
Due from Related Parties, Current 15,118 2,199 13,658  
Interest Receivable, Current 454 66 221  
Third Party [Member]        
Prepaid Expenses And Other Current Assets [Line Items]        
Notes, Loans and Financing Receivable, Net, Current 136,021 19,783 85,798  
Suppliers [Member]        
Prepaid Expenses And Other Current Assets [Line Items]        
Reserve For Unrecoverable Deposits Current ¥ 4,798 $ 698 ¥ 4,798