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Property, Plant and Equipment, net | 9 Months Ended
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Sep. 30, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consisted of:
| September 30, 2020 |  | December 31, 2019
Machinery, equipment and tooling | $ | 52,077 |  |  | $ | 19,683 |
SmartSystems | 22,393 |  |  | 15,811 |
Vehicles | 2,938 |  |  | 2,419 |
Furniture and fixtures | 1,284 |  |  | 1,228 |
Plant and building | 176,731 |  |  | 170,283 |
Real estate properties | 6,458 |  |  | 4,946 |
Railroad and sidings | 27,703 |  |  | 27,701 |
Land and land improvements | 32,956 |  |  | 21,320 |
Asset retirement obligation | 19,904 |  |  | 11,480 |
Mineral properties | 7,442 |  |  | 7,442 |
Deferred mining costs | 2,123 |  |  | 2,004 |
Construction in progress | 8,153 |  |  | 9,208 |
| 360,162 |  |  | 293,525 |
Less: accumulated depreciation and depletion | 79,020 |  |  | 63,064 |
Total property, plant and equipment, net | $ | 281,142 |  |  | $ | 230,461 |
Depreciation expense was $5,328 and $6,610 for the three months ended September 30, 2020 and 2019, respectively, and $15,856 and $18,648 for the nine months ended September 30, 2020 and 2019, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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