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LOANS AND BORROWINGS - Schedule of Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Current portion of loans and borrowings: |  |
Wyoming Industrial Development Revenue Bond loan | $ 3,512 | $ 3,414
Total current loans and borrowings | 3,512 | 3,414
Long-term loans and borrowings: |  |
Convertible debentures | 15,538 | 16,636
Wyoming Industrial Development Revenue Bond loan | 5,660 | 7,441
Total long-term loans and borrowings | $ 21,198 | $ 24,077

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