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LOANS AND BORROWINGS - Schedule of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Current portion of loans and borrowings: |  |
Wyoming Industrial Development Revenue Bond loan | $ 0 | $ 3,414
Total current loans and borrowings | 0 | 3,414
Long-term loans and borrowings: |  |
Convertible debentures | 17,251 | 16,636
Wyoming Industrial Development Revenue Bond loan | 0 | 7,441
Total long-term loans and borrowings | $ 17,251 | $ 24,077

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