CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 200,564	$ 40,833
Marketable securities (current)	222,012	275,340
Restricted cash (current)	1,024	25,032
Accounts receivable, net	352	978
Inventories	4,135	2,751
Prepaid expenses and other current assets	3,635	3,607
Total current assets	431,722	348,541
Property, plant and equipment, net	166,004	139,141
Marketable securities (long-term)	0	64,396
Restricted cash (long-term)	76,842	70,168
Operating right-of-use assets	1,671	2,414
Finance right-of-use assets	27,012	27,297
Intangible assets, net	7,995	8,938
Deposits and other assets	18,165	5,581
Total assets	729,411	666,476
Current liabilities
Accounts payable and accrued liabilities	14,916	28,288
Operating lease liabilities (current)	430	772
Finance lease liabilities (current)	2,125	3,413
Loans payable - other (current)	158	158
Total current liabilities	17,629	32,631
2021 Bonds payable (long-term)	67,038	66,486
Loans payable - other (long-term)	199	318
Operating lease liabilities (long-term)	1,734	1,902
Finance lease liabilities (long-term)	16,349	17,797
Other long-term liabilities	1,520	87
Total liabilities	104,469	119,221
Stockholders' Equity
Common stock, $0.01 par value per share; 500,000,000 and 250,000,000 shares authorized at September 30, 2022, and December 31, 2021, respectively; 237,221,732 and 201,988,662 shares issued and outstanding at September 30, 2022, and December 31, 2021, respectively.	2,372	2,020
Additional paid-in capital	1,254,733	1,103,224
Accumulated other comprehensive loss	(2,168)	(614)
Accumulated deficit	(629,995)	(557,375)
Total stockholders' equity	624,942	547,255
Total liabilities and stockholders' equity	$ 729,411	$ 666,476