Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue and cost of goods sold
Revenue from contract with Customer	$ 13	$ 3,825
Grant and other revenue	80
Total revenues	93	3,825
Cost of goods sold	1,994	8,139
Gross loss	(1,901)	(4,314)
Operating expenses:
Research and development expense	1,378	580
Selling, general and administrative expense	3,872	2,627
Preliminary stage project costs	2,727	156
Restructuring expenses		299
Total operating expenses	7,977	3,662
Loss from operations	(9,878)	(7,976)
Other income (expense):
Interest expense	(5)	(545)
(Loss) on modification of 2020 Notes		(669)
(Loss) gain from change in fair value of derivative warrant liability	(53)	7
(Loss) from change in fair value of 2020/21 Notes embedded derivative liability		(100)
Other (expense) income	(121)	30
Total other income (expense), net	(179)	(1,277)
Net loss	$ (10,057)	$ (9,253)
Net loss per share - basic and diluted (in dollars per share)	$ (0.05)	$ (0.64)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	183,566,524	14,472,798
Ethanol Sales and Related Products [Member]
Revenue and cost of goods sold
Revenue from contract with Customer		$ 3,700
Total revenues		3,700
Hydrocarbon [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	13	125
Total revenues	$ 13	$ 125