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Property, Plant and Equipment, net
 9 Months Ended
Sep. 30, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net Property, Plant and Equipment, net
Net property, plant and equipment consisted of:
September 30, 2024December 31, 2023
Machinery, equipment and tooling$41,832 $40,632 
SmartSystems
32,299 30,651 
Vehicles3,800 4,082 
Furniture and fixtures1,368 1,466 
Plant and building218,055 213,756 
Real estate properties6,980 7,209 
Railroad and sidings35,728 35,491 
Land and land improvements40,704 40,519 
Asset retirement obligations22,910 22,910 
Mineral properties7,442 7,442 
Deferred mining costs3,838 3,802 
Construction in progress4,612 6,270 
419,568 414,230 
Less: accumulated depreciation and depletion177,679 159,138 
Total property, plant and equipment, net$241,889 $255,092 
Depreciation expense was $6,946 and $6,776 for the three months ended September 30, 2024 and 2023, respectively, and $20,924 and $19,661 for the nine months ended September 30, 2024 and 2023, respectively.
During the three months ended September 30, 2024, the Company relocated its manufacturing facility from Saskatoon, Canada to Oakdale, Wisconsin in the United States and recorded a net loss of $1,063 on the disposal of fixed assets related to this relocation.