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PRC CONTRIBUTION AND PROFIT APPROPRIATION (Narrative) (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Contribution and Profit Appropriation [Line Items]      
Total contribution for employee benefits ¥ 37,594 ¥ 35,241 ¥ 29,029
China [Member] | Minimum [Member]      
Contribution and Profit Appropriation [Line Items]      
Percentage appropriation to statutory reserve required for education development reserve 25.00%    
China [Member] | Minimum [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Contribution and Profit Appropriation [Line Items]      
Percentage appropriation to statutory surplus reserve required 5.00%    
Percentage appropriation to statutory public welfare fund required 10.00%    
China [Member] | Maximum [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Contribution and Profit Appropriation [Line Items]      
Reserve level threshold for mandatory transfer requirement (as a percent) 50.00%    
Percentage appropriation to statutory surplus reserve required 10.00%    
Subsidiaries [Member] | China [Member] | Minimum [Member]      
Contribution and Profit Appropriation [Line Items]      
Percentage appropriation to general reserve fund required 10.00%    
Subsidiaries [Member] | China [Member] | Maximum [Member]      
Contribution and Profit Appropriation [Line Items]      
Reserve level threshold for mandatory transfer requirement (as a percent) 50.00%