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LOANS AND BORROWINGS - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Disclosure [Abstract] |  |
Wyoming Industrial Development Revenue Bond loan | $ 0 | $ 3,414
Total current loans and borrowings | 0 | 3,414
Convertible debentures | 15,880 | 16,636
Wyoming Industrial Development Revenue Bond loan | 0 | 7,441
Total long-term loans and borrowings | $ 15,880 | $ 24,077

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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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