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4. Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Total revenues    
Third Eye Capital term notes $ 6,737 $ 6,577
Third Eye Capital revolving credit facility 30,293 24,927
Third Eye Capital revenue participation term notes 11,311 11,042
Third Eye Capital acquisition term notes 19,525 19,085
Third Eye Capital promissory note 3,669 0
Cilion shareholder Seller note payable 5,748 5,674
Subordinated notes 8,200 7,565
EB-5 long term promissory notes 35,651 35,027
Unsecured working capital loans 3,697 1,817
Total debt 124,831 111,714
Less current portion of debt 17,217 11,409
Total long term debt $ 107,614 $ 100,305