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ACQUIRED INTANGIBLE ASSETS, NET (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
ACQUIRED INTANGIBLE ASSETS, NET      
Total costs $ 4,999    
Less: accumulated amortization (508)    
Intangible assets, net 4,491    
Amortization expenses 529 $ 0 $ 0
Estimated amortization expenses      
2019 1,133    
2020 1,133    
2021 1,133    
2022 714    
2023 208    
Thereafter 170    
Trademark      
ACQUIRED INTANGIBLE ASSETS, NET      
Total costs 1,367    
Student base      
ACQUIRED INTANGIBLE ASSETS, NET      
Total costs $ 3,632