Other Income (Expense) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	May 31, 2024	Dec. 31, 2023
Long-Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 4,383,000		$ 4,383,000			$ 7,148,000
Other income (expense)
Gain on sale of patents and intellectual property	0	$ 0	3,641,000	$ 0
Gain on sale of equipment	2,636,000	456,000	2,505,000	541,000
Gain on forfeiture of non-refundable deposits	0	0	1,550,000	0
Other miscellaneous income	50,000	0	50,000	0
Fair value adjustments to warrants – Notes 13 and 20	4,000	1,000	11,000	182,000
Unrealized loss on securities available-for-sale	(287,000)	0	(777,000)	0
Total	2,403,000	$ 457,000	6,980,000	$ 723,000
SAG Mill, Ball Mill, Sub-Station Transformer
Long-Lived Assets Held-for-sale [Line Items]
Assets held for sale					$ 2,000,000
Other income (expense)
Gain on forfeiture of non-refundable deposits			$ 1,600,000
Certain Unused Equipment | SAG Mill, Ball Mill, Sub-Station Transformer
Long-Lived Assets Held-for-sale [Line Items]
Other income upon completion of sale	$ 1,700,000