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14. Income Tax (Details 2) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Assets & (Liabilities): |  |
Org, start-up and intangible assets | $ 4,723 | $ 5,045
Stock based comp | 301 | 223
Prop., plant, and equip. | (13,631) | (14,551)
NOLs and R&D credits | 56,270 | 53,874
Interest expense carryover | 4,722 | 0
Ethanol Credits | 1,500 | 1,500
Debt extinguishment | 0 | 91
Other, net | 450 | 545
Subtotal | 54,335 | 46,727
Valuation allowance | (54,335) | (46,727)
Deferred tax assets (liabilities) | $ 0 | $ 0

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