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INTANGIBLE ASSETS, NET (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
INTANGIBLE ASSETS, NET      
Intangible assets subject to amortization $ 13,545 $ 13,409 $ 13,417
Less: accumulated amortization (4,293) (3,089) (1,940)
impairment (3,605)    
Intangible assets, net 5,647 10,320 11,477
Estimated amortization expenses      
2023 1    
2024 1    
2025 1    
2026 1    
2027 1    
Total expected amortization expense 5    
Trademark      
INTANGIBLE ASSETS, NET      
Intangible assets not subject to amortization 7,841 7,766 7,766
Student base      
INTANGIBLE ASSETS, NET      
Intangible assets subject to amortization 4,036 3,998 4,006
Initial franchise      
INTANGIBLE ASSETS, NET      
Intangible assets subject to amortization 1,641 1,626 1,626
Software and courses      
INTANGIBLE ASSETS, NET      
Intangible assets subject to amortization $ 27 $ 19 $ 19