Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue and cost of goods sold
Revenue from contract with Customer	$ 24,453	$ 32,863
Grant and other revenue	34	25
Total revenues	24,487	32,863
Cost of goods sold	36,733	41,568
Gross loss	(12,246)	(8,705)
Operating expenses
Research and development expense	4,020	5,374
Selling, general and administrative expense	10,085	8,122
Total operating expenses	14,105	13,496
Loss from operations	(26,351)	(22,201)
Other (expense) income
Interest expense	(2,732)	(3,237)
(Loss) on exchange or conversion of debt		(2,202)
Gain from change in fair value of 2020 Notes embedded derivative	394	2,637
Gain (loss) from change in fair value of derivative warrant liability	14	(2,976)
Other income (expense)	15	3
Total other (expense) income	(2,309)	(5,775)
Net loss	$ (28,660)	$ (27,976)
Net loss per share - basic and diluted (in dollars per share)	$ (2.35)	$ (5.74)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	12,177,906	4,876,897
Ethanol Sales and Related Products [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	$ 22,115	$ 31,641
Total revenues	22,115	31,641
Hydrocarbon [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	2,338	1,197
Total revenues	$ 2,338	$ 1,197