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Property, Plant and Equipment, net | 6 Months Ended
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Jun. 30, 2019
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consisted of:
| June 30, 2019 |  | December 31, 2018
Machinery, equipment and tooling | $ | 16,080 |  |  | $ | 14,858 |
SmartSystems | 9,532 |  |  | 5,286 |
Vehicles | 2,214 |  |  | 1,955 |
Furniture and fixtures | 1,217 |  |  | 1,140 |
Plant and building | 160,413 |  |  | 158,882 |
Real estate properties | 4,855 |  |  | 4,601 |
Railroad and sidings | 27,347 |  |  | 27,347 |
Land and land improvements | 27,421 |  |  | 27,167 |
Asset retirement obligation | 19,770 |  |  | 16,469 |
Mineral properties | 10,075 |  |  | 10,075 |
Deferred mining costs | 1,806 |  |  | 1,806 |
Construction in progress | 25,132 |  |  | 21,619 |
| 305,862 |  |  | 291,205 |
Less: accumulated depreciation and depletion | 54,884 |  |  | 42,809 |
Total property, plant and equipment, net | $ | 250,978 |  |  | $ | 248,396 |
Depreciation expense was $6,171 and $3,994 for the three months ended June 30, 2019 and 2018, respectively, and $12,038 and $7,151 for the six months ended June 30, 2019 and 2018, respectively. Depletion expense was $13 and $18 for the three months ended June 30, 2019 and 2018, respectively, and $18 and $20 for the six months ended June 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 six months ended June 30, 2019 and 2018.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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