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4. Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Total revenues    
Third Eye Capital term notes $ 6,459 $ 6,269
Third Eye Capital revolving credit facility 32,525 25,870
Third Eye Capital revenue participation term notes 10,846 10,526
Third Eye Capital acquisition term notes 18,768 18,260
Cilion shareholder Seller note payable 5,636 5,523
State Bank of India secured term loan 3,161 4,200
Subordinated notes 7,114 6,340
EB-5 long term promissory notes 25,830 23,907
Unsecured working capital loans 441 0
Total debt 110,780 100,895
Less current portion of debt 12,546 11,947
Total long term debt $ 98,234 $ 88,948