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Property, Plant and Equipment, net
 9 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
Property, Plant and Equipment, net
Net property, plant and equipment consisted of:
 
September 30, 2019
 
December 31, 2018
Machinery, equipment and tooling
$
16,863

 
$
14,858

SmartSystems
14,123

 
5,286

Vehicles
2,436

 
1,955

Furniture and fixtures
1,228

 
1,140

Plant and building
160,736

 
158,882

Real estate properties
4,913

 
4,601

Railroad and sidings
27,347

 
27,347

Land and land improvements
27,683

 
27,167

Asset retirement obligation
19,770

 
16,469

Mineral properties
10,075

 
10,075

Deferred mining costs
1,883

 
1,806

Construction in progress
25,022

 
21,619

 
312,079

 
291,205

Less: accumulated depreciation and depletion
61,593

 
42,809

Total property, plant and equipment, net
$
250,486

 
$
248,396


Depreciation expense was $6,610 and $4,608 for the three months ended September 30, 2019 and 2018, respectively, and $18,648 and $11,751 for the nine months ended September 30, 2019 and 2018, respectively. Depletion expense was $20 and $31 for the three months ended September 30, 2019 and 2018, respectively, and $38 and $51 for the nine months ended September 30, 2019 and 2018, respectively.
The Company capitalized no interest expense associated with the construction of new property, plant and equipment for the three and nine months ended September 30, 2019 and 2018.