Annual report pursuant to Section 13 and 15(d)

PREPAID EXPENSES AND OTHER ASSETS (Details)

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PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid license $ 2,419 $ 1,919
Spare parts 1,597 954
Other prepaid expenses and assets 648 772
Total $ 4,664 $ 3,645