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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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