PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid license	$ 806	$ 1,209
Spare parts	2,049	1,857
Insurance receivable	0	1,148
Other prepaid expenses and assets	378	733
Total prepaid expenses and other assets	$ 3,233	$ 4,947