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FAIR VALUE MEASUREMENTS - Financial liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
5% Notes | $ 623 | $ 938
Totals | 623 | 938
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
5% Notes | 0 | 0
Totals | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
5% Notes | 0 | 0
Totals | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
5% Notes | 623 | 938
Totals | $ 623 | $ 938

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