Accounts Payable, Accrued Expenses, and Other Liabilities - Schedule of Other Liabilities (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) sub-stationTransformer mill	Dec. 31, 2024 USD ($) mill	Dec. 31, 2023 USD ($) sub-stationTransformer mill	Mar. 01, 2024 mill
Long-Lived Assets Held-for-sale [Line Items]
Accounts payable and accrued expenses	$ 1,631	$ 2,389	$ 1,631
Other liabilities, current
Accrued compensation	3,000	3,116	3,000
Accrued directors’ fees	38	41	38
Operating lease liability	25	9	25
Warrant liabilities	0	6	0
Contract liabilities	1,550	0	1,550
Total	$ 6,244	$ 5,561	$ 6,244
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable, accrued expenses, and other liabilities	Accounts payable, accrued expenses, and other liabilities	Accounts payable, accrued expenses, and other liabilities
Other liabilities, non-current
Warrant liabilities	$ 26	$ 0	$ 26
Operating lease liability	8	0	8
Total	$ 34	$ 0	$ 34
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total	Total	Total
Release payment			$ 1,000
Firm purchase commitment (gain) loss			1,200
Gain on forfeiture of non-refundable deposits		$ 1,550	$ 0
SAG Mill, Ball Mill, Sub-Station Transformer
Other liabilities, non-current
Proceeds from sale, property, held-for-sale	$ 1,600
Gain on forfeiture of non-refundable deposits		$ 1,600
SAG Mill
Other liabilities, non-current
Number of mills | mill	1	1	1
Number of assets terminated in purchase agreement | mill				1
Ball Mills
Other liabilities, non-current
Number of mills | mill	1	1	1
Number of assets terminated in purchase agreement | mill				1
Gain on forfeiture of non-refundable deposits		$ 2,000
Sub-Station Transformer
Other liabilities, non-current
Number of transformers to be purchased | sub-stationTransformer	2		2