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4. Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Debt Disclosure [Abstract] |  |
Third Eye Capital term notes | $ 7,022 | $ 7,024
Third Eye Capital revolving credit facility | 58,742 | 47,225
Third Eye Capital revenue participation term notes | 11,792 | 11,794
Third Eye Capital acquisition term notes | 24,907 | 23,841
Third Eye Capital promissory note | 2,814 | 0
Cilion shareholder seller notes payable | 6,086 | 5,974
Subordinated notes | 11,085 | 10,080
EB-5 long term promissory notes | 40,199 | 38,536
Unsecured working capital loans | 3,518 | 4,822
GAFI Term and Revolving loans | 29,373 | 25,821
Total debt | 195,538 | 175,117
Less current portion of debt | 22,476 | 17,298
Total long term debt | $ 173,062 | $ 157,819

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