Property, Plant and Equipment, Net - Components of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 86,729		$ 87,105
Less, accumulated depreciation and amortization	(34,636)		(34,014)
Total	52,093		53,091
Payments to acquire mineral properties	25	$ 271
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	$ 17,615		17,556
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	10 years
Property, plant and equipment, gross	$ 9,419		9,419
Mine equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,750		4,732
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,700		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	$ 35,052		$ 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