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INTANGIBLE ASSETS, NET (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization $ 16,473 $ 16,578
Less: accumulated amortization (4,854) (3,614)
impairment (5,328) (1,865)
Total expected amortization expense 665  
Intangible assets, net 6,291 11,099
Estimated amortization expenses    
2023 79  
2024 79  
2025 79  
2026 79  
2027 79  
2028 and thereafter 270  
Total expected amortization expense 665  
Trademark    
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization 657 711
Student base    
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization 4,036 3,998
Initial franchise    
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization 1,641 1,626
Brand    
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization 1,131 1,224
Non-compete agreement    
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization 638 690
Customer relationship    
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization 87 94
Software and courses    
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization 413 438
Contracts    
INTANGIBLE ASSETS, NET    
Intangible assets subject to amortization 29 31
Trademark    
INTANGIBLE ASSETS, NET    
Intangible assets not subject to amortization $ 7,841 $ 7,766