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, 2021
Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid license $ 0 $ 403
Prepaid insurance premiums 1,355 4,241
Spare parts 2,366 2,376
Cash held in escrow by AMAK 823 1,877
Other prepaid expenses and assets 550 301
Total prepaid expenses and other assets $ 5,094 $ 9,198