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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts receivable    
Trade receivables $ 2,319 $ 2,397
Other 4,308 1,500
Total 6,627 3,897
Less: allowance for doubtful accounts (20) (25)
Net accounts receivable $ 6,607 $ 3,872