Quarterly report pursuant to Section 13 or 15(d)

3. PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details)

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3. PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]    
Deposits $ 548 $ 572
Insurance 574 593
Supplier advances 476 504
Nevada building sale proceeds 0 2,800
Other 935 1,922
Total prepaid expenses and other current assets $ 2,533 $ 6,391