Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue and cost of goods sold
Revenue from contract with Customer	$ 533	$ 5,463	$ 24,453
Other revenue	178	226	34
Total revenues	711	5,536	24,487
Cost of goods sold (exclusive of depreciation shown below), (including noncash compensation expense of $0.04 million (none in 2020 or 2019))	7,687	9,313	30,286
Depreciation and amortization, cost	4,478	5,690	6,447
Gross loss	(11,454)	(9,467)	(12,246)
Operating expenses:
Research and development expense (including noncash compensation expense of $2.0 million, $0.6 million, $0.3 million, respectively)	6,775	3,511	3,868
Selling, general and administrative expense (including noncash compensation expense of $7.8 million, $1.5 million and $1.1 million, respectively)	25,493	11,192	9,823
Preliminary stage project costs	10,581	1,698	205
Loss on disposal of assets	5,137	625	4
Depreciation and amortization	650	214	209
Restructuring expense	0	254	0
Total operating expenses	48,636	17,494	14,109
Loss from operations	(60,090)	(26,961)	(26,355)
Other income (expense):
Gain on forgiveness of SBA Loans	641	0	0
Interest expense	(251)	(2,094)	(2,738)
Interest and dividend income	571	102	33
(Loss) on modification of 2020 Notes	0	(732)	0
(Loss) on conversion of 2020/21 Notes to common stock	0	(1,916)	0
(Loss) gain from change in fair value of 2020/21 Notes and 2020 Notes embedded derivative liability	0	(8,607)	394
Other income (expense), net	(74)	22	6
Total other income (expense)	887	(13,225)	(2,305)
Net loss	$ (59,203)	$ (40,186)	$ (28,660)
Net loss per share - basic and diluted (in dollars per share)	$ (0.30)	$ (0.71)	$ (2.35)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	195,794,606	56,881,586	12,177,906
Ethanol Sales and Related Products [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	$ 50	$ 3,809	$ 22,115
Total revenues	50	3,809	22,115
Hydrocarbon [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	483	1,501	2,338
Total revenues	$ 483	$ 1,501	$ 2,338