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, 2017
Dec. 31, 2016
PREPAID EXPENSES AND OTHER ASSETS [Abstract]    
Prepaid license $ 1,919 $ 1,919
Prepaid catalyst 93 187
Prepaid insurance 637 797
Other prepaid expenses and assets 925 608
Total $ 3,574 $ 3,511