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LONG-TERM DEBT - Schedule of long-term debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Long-Term Debt (Details) - Schedule of long-term debt [Line Items] |  |
Long-term debt | $ 189 | $ 241
Less Current Maturities | (83) | (83)
Total Long-Term Debt | 106 | 158
Wells Fargo Equipment Finance |  |
Long-Term Debt (Details) - Schedule of long-term debt [Line Items] |  |
Long-term debt | 0 | 1
Notes payable issued in connection with seller financing |  |
Long-Term Debt (Details) - Schedule of long-term debt [Line Items] |  |
Long-term debt | $ 189 | $ 240

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