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Property, Plant and Equipment, net | 12 Months Ended
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Dec. 31, 2016
Property Plant And Equipment [Abstract] |
Property, Plant and Equipment, net | 7. Property, Plant and Equipment, net Net property, plant and equipment consists of:
|  | December 31, |
|  | 2016 |  |  | 2015 |
Machinery, equipment and tooling |  | $ | 4,841 |  |  | $ | 4,673 |
Vehicles |  |  | 953 |  |  |  | 952 |
Furniture and fixtures |  |  | 305 |  |  |  | 303 |
Plant and building |  |  | 64,390 |  |  |  | 64,001 |
Real estate properties |  |  | 3,503 |  |  |  | 3,500 |
Railroad and sidings |  |  | 7,927 |  |  |  | 7,868 |
Land and improvements |  |  | 13,317 |  |  |  | 12,977 |
Asset retirement obligation |  |  | 1,324 |  |  |  | 1,135 |
Mineral properties |  |  | 9,785 |  |  |  | 9,785 |
Deferred mining costs |  |  | 417 |  |  |  | 155 |
Construction in progress |  |  | 16,715 |  |  |  | 16,637 |
|  |  | 123,477 |  |  |  | 121,986 |
Less: accumulated depreciation and depletion |  |  | 19,381 |  |  |  | 13,058 |
Total property, plant and equipment, net |  | $ | 104,096 |  |  | $ | 108,928 |
Depreciation expense was $6,441, $5,276 and $3,611 for the years ended December 31, 2016, 2015 and 2014, respectively. Depletion expense was $3, $13 and $14 for the years ended December 31, 2016, 2015 and 2014, respectively. The Company capitalized $132, $1,808 and $453 of interest expense associated with the construction of new plant and equipment for the years ended December 31, 2016, 2015 and 2014, respectively.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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