Property, Plant and Mine Development, net - Summary of Property, Equipment and Mine Development (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, equipment and mine development - net
Property and equipment, gross	$ 261,938	$ 153,595
Accumulated depreciation and amortization	(105,167)	(91,084)
Total property, equipment and mine development - net	156,771	62,511
Accrued capital expenditures	1,700	1,000
Asset retirement costs
Property, equipment and mine development - net
Property and equipment, gross	1,065	1,064
Construction-In-Progress
Property, equipment and mine development - net
Property and equipment, gross	15,854	7,158
Furniture and office equipment
Property, equipment and mine development - net
Property and equipment, gross	1,685	1,839
Land And Mineral Rights
Property, equipment and mine development - net
Property and equipment, gross	9,230	230
Mining Properties and Mineral Rights
Property, equipment and mine development - net
Property and equipment, gross	79,964
Light Vehicles And Other Mobile Equipment
Property, equipment and mine development - net
Property and equipment, gross	2,224	2,192
Machinery And Equipment
Property, equipment and mine development - net
Property and equipment, gross	33,213	31,227
Mill facilities and infrastructure
Property, equipment and mine development - net
Property and equipment, gross	24,973	24,407
Mine Development
Property, equipment and mine development - net
Property and equipment, gross	92,138	83,859
Software and licenses
Property, equipment and mine development - net
Property and equipment, gross	$ 1,592	$ 1,619

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