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COMMITMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
COMMITMENTS      
Rental expense $ 942 $ 1,032 $ 793
Operating lease commitments, due 2021 717    
Operating lease commitments, due 2022 137    
Operating lease commitments, due 2023 $ 4