Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue and cost of goods sold
Revenue from contract with Customer	$ 5,463	$ 24,453
Grant and other revenue	226	34
Total revenues	5,536	24,487
Cost of goods sold	15,003	36,733
Gross loss	(9,467)	(12,246)
Operating expenses:
Research and development expense	4,086	4,020
Selling, general and administrative expense	12,528	10,085
Restructuring expenses	254
Total operating expenses	16,868	14,105
Loss from operations	(26,335)	(26,351)
Other income (expense):
Interest expense	(2,094)	(2,732)
(Loss) on modification of 2020 Notes	(732)
(Loss) on conversion of 2020/21 Notes to common stock	(1,916)
(Loss) gain from change in fair value of 2020/21 Notes and 2020 Notes embedded derivative liability	(8,607)	394
(Loss) gain from change in fair value of derivative warrant liability	(23)	14
Other (expense) income	(479)	15
Total other income (expense)	(13,851)	(2,309)
Net loss	$ (40,186)	$ (28,660)
Net loss per share - basic and diluted (in dollars per share)	$ (0.71)	$ (2.35)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	56,881,586	12,177,906
Ethanol Sales and Related Products [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	$ 3,809	$ 22,115
Total revenues	3,809	22,115
Hydrocarbon [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	1,501	2,338
Total revenues	$ 1,501	$ 2,338