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5. Notes Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Total revenues    
Third Eye Capital term note $ 6,269 $ 7,394
Third Eye Capital revolving credit facility 25,870 22,330
Third Eye Capital revenue participation term note 10,526 10,195
Third Eye Capital acquisition term note 18,260 17,728
Cilion shareholder Seller note payable 5,523 5,373
State Bank of India secured term loan 4,200 6,032
Subordinated notes 6,340 5,428
EB-5 long term promissory notes 23,907 1,534
Unsecured working capital loans and short-term notes 0 1,287
Total debt 100,895 77,301
Less current portion of debt 11,947 12,746
Total long term debt $ 89,138 $ 64,832