Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 109,223	$ 25,552
Prepaid expenses and other current assets	1,309	835
Total current assets	110,532	26,387
Property, plant and equipment, net	182,818	173,816
Operating lease right-of-use assets, net	1,065	590
Other non-current assets, net	26,301	21,312
Total assets	320,716	222,105
Current liabilities
Accounts payable	4,887	281
Share-based compensation liability	182	182
Accrued liabilities and other current liabilities	10,988	5,791
Current common stock warrant liabilities	0	1,376
Current operating lease liabilities	968	596
Total current liabilities	17,025	8,226
Non-current common stock warrant liabilities	8,234	2,587
Non-current operating lease liabilities	143	0
Other non-current liabilities	23,000	23,000
Total liabilities	48,402	33,813
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock, $0.0001 par value Authorized: 480.0 million shares at September 30, 2022 and December 31, 2021; Issued and outstanding: 143.2 million shares and 120.8 million shares at September 30, 2022 and December 31, 2021, respectively	14	12
Treasury stock: 889,713 shares and 346,126 shares at September 30, 2022 and December 31, 2021, respectively, at cost	(4,127)	(1,315)
Preferred stock, $0.0001 par value Authorized: 0.5 million, after designation of the Convertible Preferred Stock Issued and outstanding: none at September 30, 2022 and December 31, 2021	0	0
Additional paid-in-capital	291,684	191,264
Accumulated deficit	(211,215)	(170,069)
Total stockholders’ equity	76,356	19,892
Total liabilities, convertible preferred stock and stockholders’ equity	320,716	222,105
Series A Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock	70,594	63,791
Series B Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock	71,091	64,602
Series C Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock	$ 54,273	$ 40,007