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COMMITMENTS AND CONTINGENCIES (Right of Use Assets Related to Finance Leases) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES.    
Finance lease right-of-use assets $ 78 $ 78
Accumulated amortization (48) (42)
Finance lease right-of-use assets, net $ 30 $ 36