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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 366,788	$ 359,664
Less: accumulated depreciation and depletion	103,669	84,988
Total property, plant and equipment, net	263,119	274,676
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,456	29,002
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,159	22,352
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,014	2,893
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,326	1,302
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	199,958	199,867
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,496	6,458
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,703	27,703
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33,155	33,040
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,730	19,993
Mineral properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,442	7,442
Deferred mining costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,455	2,123
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,894	$ 7,489

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