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ACCOUNTS RECEIVABLE - Summary of accounts receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Accounts receivable |  |
Trade receivables | $ 2,397 | $ 1,377
Other | 1,500 | 1,699
Total | 3,897 | 3,076
Less: allowance for doubtful accounts | (25) | (25)
Net accounts receivable | $ 3,872 | $ 3,051

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