CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 347,650	$ 237,125
Marketable securities		167,408
Restricted cash	71,201	1,032
Trade accounts receivable, net	1,011	476
Inventories	4,387	6,347
Prepaid expenses and other current assets	4,439	3,034
Total current assets	428,688	415,422
Property, plant and equipment, net	198,759	176,872
Restricted cash	6,568	77,219
Operating right-of-use assets	1,239	1,331
Finance right-of-use assets	215	219
Intangible assets, net	7,108	7,691
Deposits and other assets	31,980	21,994
Total assets	674,557	700,748
Current liabilities
Accounts payable and accrued liabilities	21,365	24,760
Operating lease liabilities	454	438
Finance lease liabilities	27	79
Loans payable	144	159
2021 Bonds payable, net	67,594
Total current liabilities	89,584	25,436
2021 Bonds payable, net		67,223
Loans payable	94	159
Operating lease liabilities	1,307	1,450
Finance lease liabilities	193	183
Other liabilities	280	820
Total liabilities	91,458	95,271
Stockholders' Equity
Common stock, $0.01 par value per share; 500,000,000 shares authorized; 237,647,431 and 237,166,625 shares issued and outstanding at June 30, 2023, and December 31, 2022, respectively	2,377	2,372
Additional paid-in capital	1,268,142	1,259,527
Accumulated other comprehensive loss		(1,040)
Accumulated deficit	(687,420)	(655,382)
Total stockholders' equity	583,099	605,477
Total liabilities and stockholders' equity	$ 674,557	$ 700,748