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PREPAYMENTS AND OTHER CURRENT ASSETS (Narrative) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Prepaid Expenses And Other Current Assets [Line Items]      
Reserve For Unrecoverable Deposits Current $ 1,295 ¥ 9,013 ¥ 14,798
Amounts due from subsidiaries 550 3,833 20,671
Interest Receivable, Current | $ 415    
Notes, Loans and Financing Receivable, Net, Current 8,317 57,904 136,021
JYADK [Member]      
Prepaid Expenses And Other Current Assets [Line Items]      
Reserve For Unrecoverable Deposits Current 1,293 9,000 10,000
Amounts due from subsidiaries $ 1,749 12,173 15,118
Interest Receivable, Current   2,891 454
Suppliers [Member]      
Prepaid Expenses And Other Current Assets [Line Items]      
Reserve For Unrecoverable Deposits Current   ¥ 0 ¥ 4,798