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ACCOUNTS RECEIVABLE (Tables)
12 Months Ended
Dec. 31, 2017
ACCOUNTS RECEIVABLE  
Schedule of accounts receivable
December 31,   2017     2016  
(in thousands)                
Trade receivables   $ 1,377     $ 744  
Other     1,699       368  
Total     3,076       1,112  
Less: allowance for doubtful accounts     (25 )     (25 )
Net accounts receivable   $ 3,051     $ 1,087