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ACCOUNTS RECEIVABLE - Summary of accounts receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable    
Trade receivables $ 744 $ 557
Other 368 724
Total 1,112 1,281
Less: allowance for doubtful accounts (25) (25)
Net accounts receivable $ 1,087 $ 1,256