Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue and cost of goods sold
Revenue from contract with Customer	$ 120	$ 192	$ 479	$ 5,005
Other revenue	22	70	178	116
Total revenues	142	192	657	5,005
Cost of goods sold	3,482	2,260	8,270	13,043
Gross loss	(3,340)	(2,068)	(7,613)	(8,038)
Operating expenses:
Research and development expense	1,541	870	4,323	2,127
Selling, general and administrative expense	9,335	2,892	18,027	8,179
Preliminary stage project costs	313	323	8,512	700
Loss on disposal of assets	183	0	5,137	38
Restructuring expenses	0	(50)	0	254
Total operating expenses	11,372	4,035	35,999	11,298
Loss from operations	(14,712)	(6,103)	(43,612)	(19,336)
Other income (expense):
Gain on forgiveness of SBA Loans	0	0	641	0
Interest expense	(67)	(473)	(78)	(1,559)
(Loss) on modification of 2020 Notes	0	0	0	(726)
(Loss) on conversion of 2020/21 Notes to common stock	0	(543)	0	(543)
Gain (loss) from change in fair value of derivative warrant liability	6	0	(4)	8
Gain (loss) from change in fair value of 2020/21 Notes embedded derivative liability	0	247	0	(29)
Other income (expense), net	393	36	363	53
Total other income (expense), net	332	(733)	922	(2,796)
Net loss	$ (14,380)	$ (6,836)	$ (42,690)	$ (22,132)
Net loss per share - basic and diluted (in dollars per share)	$ (0.07)	$ (0.09)	$ (0.22)	$ (0.62)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	199,341,519	77,049,896	193,739,605	35,682,794
Ethanol Sales and Related Products [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	$ 16	$ 21	$ 16	$ 3,804
Total revenues	16	21	16	3,804
Hydrocarbon [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	104	101	463	1,085
Total revenues	$ 104	$ 101	$ 463	$ 1,085