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LEASE - Summary of future minimum rent payable under non-cancellable operating leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2023 $ 159  
2024 129  
2025 133  
2026 100  
Total lease payments 521  
Less: Imputed interest (91)  
Present value of lease liabilities 430  
Lease liabilities - current 119  
Lease liabilities - non-current $ 311 $ 431