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Property, Plant and Equipment, net
 9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
Property, Plant and Equipment, net
Net property, plant and equipment consisted of:
 
September 30, 2018
 
December 31, 2017
Machinery, equipment and tooling
$
11,179

 
$
7,802

Wellsite storage solutions
307

 
—

Vehicles
1,735

 
1,546

Furniture and fixtures
837

 
720

Plant and building
147,642

 
81,561

Real estate properties
4,441

 
4,432

Railroad and sidings
25,691

 
10,254

Land and land improvements
24,981

 
16,378

Asset retirement obligation
10,484

 
8,408

Mineral properties
10,074

 
9,878

Deferred mining costs
782

 
657

Construction in progress
32,363

 
56,493

 
270,516

 
198,129

Less: accumulated depreciation and depletion
37,335

 
26,367

Total property, plant and equipment, net
$
233,181

 
$
171,762


Depreciation expense was $4,608 and $1,744 for the three months ended September 30, 2018 and 2017, respectively, and $11,751 and $5,094 for the nine months ended September 30, 2018 and 2017, respectively. Depletion expense was $31 and $12 for the three months ended September 30, 2018 and 2017, respectively, and $51 and $22 for the nine months ended September 30, 2018 and 2017, 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, 2018 and 2017.