CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 237,125	$ 40,833
Marketable securities (current)	167,408	275,340
Restricted cash (current)	1,032	25,032
Trade accounts receivable, net	476	978
Inventories	6,347	2,751
Prepaid expenses and other current assets	3,034	3,607
Total current assets	415,422	348,541
Property, plant and equipment, net	176,872	137,742
Marketable securities (non-current)	0	64,396
Restricted cash (non-current)	77,219	70,168
Operating right-of-use assets	1,331	2,414
Finance right-of-use assets	219	236
Intangible assets, net	7,691	8,938
Deposits and other assets	21,994	12,946
Total Assets	700,748	645,381
Current liabilities
Accounts payable and accrued liabilities	24,760	28,150
Operating lease liabilities (current)	438	772
Finance lease liabilities (current)	79	11
Loans payable - other (current)	159	158
Total current liabilities	25,436	29,091
Long-term portion	67,223	66,486
Loans payable - other (long-term)	159	318
Operating lease liabilities (long-term)	1,450	1,902
Finance lease liabilities (long-term)	183	242
Other long-term liabilities	820	87
Total liabilities	95,271	98,126
Commitments and Contingencies
Stockholders' Equity
Common stock, $0.01 par value per share; 500,000,000 and 250,000,000 authorized at December 31, 2022 and 2021, respectively; 237,166,625 and 201,988,662 shares issued and outstanding at December 31, 2022 and 2021, respectively.	2,372	2,020
Additional paid-in capital	1,259,527	1,103,224
Accumulated other comprehensive loss	(1,040)	(614)
Accumulated deficit	(655,382)	(557,375)
Total stockholders' equity	605,477	547,255
Total Liabilities and Stockholders' Equity	$ 700,748	$ 645,381