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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts receivable    
Trade receivables $ 3,253 $ 2,319
Other 1,469 4,308
Total 4,722 6,627
Less: allowance for credit losses (16) (20)
Net accounts receivable $ 4,706 $ 6,607