Property, Plant, and Equipment, Net - Components of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 87,703	$ 87,105
Less, accumulated depreciation and amortization	(35,739)	(34,014)
Total	51,964	53,091
Production leach pads
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 11,190	11,190
Test leach pads
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	18 months
Property, plant and equipment, gross	$ 6,241	6,241
Process equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 17,881	17,556
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	10 years
Property, plant and equipment, gross	$ 9,272	9,419
Mine equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,998	4,732
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,854	1,700
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	7 years
Property, plant and equipment, gross	$ 713	713
Mineral properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	50	50
Construction in progress and other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 35,504	$ 35,504
Minimum | Process equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	5 years
Minimum | Mine equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	5 years
Minimum | Vehicles
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	3 years
Maximum | Process equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	15 years
Maximum | Mine equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	7 years
Maximum | Vehicles
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	5 years