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SHARE-BASED AWARDS (Schedule of Share-Based Compensation Expense) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ 2,958 ¥ 20,593 ¥ 11,139 ¥ 11,641
General and administrative expenses        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation 2,539 17,673 9,173 10,099
Selling Expenses [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ 419 ¥ 2,920 ¥ 1,966 ¥ 1,542