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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 298,762	$ 293,525
Less: accumulated depreciation and depletion	73,597	63,064
Total property, plant and equipment, net	225,165	230,461
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,145	19,683
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,538	15,811
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,708	2,419
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,214	1,228
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	170,401	170,283
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,678	4,946
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,703	27,701
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,337	21,320
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,480	11,480
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	2,104	2,004
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,012	$ 9,208

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