Quarterly report pursuant to Section 13 or 15(d)

PREPAID EXPENSES AND OTHER ASSETS (Details)

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PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid license $ 1,919 $ 1,919
Prepaid catalyst 682 779
Prepaid insurance 115 0
Spare parts 1,349 954
Other prepaid expenses and assets 1,123 772
Total $ 5,188 $ 4,424