Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 40,012	$ 62,789
Prepaid expenses and other current assets	13,328	1,149
Total current assets	53,340	63,938
Property, plant and equipment, net	266,427	218,646
Operating lease right-of-use assets, net	951	1,474
Other non-current assets, net	32,068	28,372
Total assets	352,786	312,430
Current liabilities
Accounts payable	12,815	1,084
Accrued liabilities and other current liabilities	19,762	23,184
Current common stock warrant liabilities	8,702	0
Current derivative liability	3,395	0
Current operating lease liabilities	634	1,093
Total current liabilities	45,308	25,361
Non-current common stock warrant liabilities	3,910	6,790
Non-current operating lease liabilities	331	465
Non-current derivative liability	84,055	0
Other non-current liabilities	23,000	23,000
Total liabilities	156,604	55,616
Commitments and contingencies (Note 13)
Stockholders’ equity (deficit)
Common stock, $0.0001 par value Authorized: 480.0 million shares at June 30, 2023 and December 31, 2022; Issued and outstanding: 157.5 million shares and 143.5 million shares at June 30, 2023 and December 31, 2022, respectively	16	14
Treasury stock: 1,003,174 shares and 991,089 shares at June 30, 2023 and December 31, 2022, respectively, at cost	(4,657)	(4,587)
Preferred stock, $0.0001 par value Authorized: 0.5 million, after designation of the Convertible Preferred Stock Issued and outstanding: none at June 30, 2023 and December 31, 2022	0	0
Additional paid-in-capital	362,735	289,084
Accumulated deficit	(377,776)	(230,140)
Total stockholders’ equity (deficit)	(19,682)	54,371
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	352,786	312,430
Series A Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock	78,056	73,026
Series B Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock	78,206	73,408
Series C Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock	$ 59,602	$ 56,009