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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
USD ($)
Basis of presentation        
Exchange rate 6.8755     6.8755
Original maturity period of term deposits 3 months      
Advertising expenses ¥ 8,450 ¥ 2,701 ¥ 1,857  
Basis of consolidation        
Accounts Receivable, Net, Current 18,132 24,511   $ 2,637
Deferred Revenue, Revenue Recognized 114,396 109,484    
Revenue, Remaining Performance Obligation, Amount ¥ 125,414 ¥ 119,581    
Minimum [Member]        
Basis of consolidation        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 1 year      
Maximum [Member]        
Basis of consolidation        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 4 years