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OPERATING LEASES - Maturities of lease liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
2021 $ 44  
2022 27  
Total undiscounted lease payment 71  
Less: Imputed interest (6)  
Total lease liabilities $ 65 $ 2,595