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
Sep. 30, 2019
Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid license $ 1,411 $ 2,419
Spare parts 1,816 1,597
Other prepaid expenses and assets 499 648
Total prepaid expenses and other assets $ 3,726 $ 4,664