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Acquisitions (Tables) | 9 Months Ended
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Sep. 30, 2019
Business Combinations [Abstract] |
Schedule of useful lives of property, plant and equipment | The acquisition cost has been allocated to the Company’s fixed assets as set forth below.
Machinery, equipment and tooling | $ | 1,478 |
Plant and building | 1,407 |
Railroad and sidings | 9,926 |
Land improvements | 2,738 |
Total assets acquired | $ | 15,549 |
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 |
Schedule of consideration transferred | The table below presents the calculation of the total purchase consideration.
Base price - cash | $ | 30,000 |
Contingent consideration – earnout | 9,200 |
Working capital adjustment | (122 | )
Total purchase consideration | $ | 39,078 |
Schedule of assets acquired and liabilities assumed | The Company’s allocation of the purchase price in connection with the acquisition was calculated as follows:
|  | Fair Value |  | Useful Life (in years)
Assets Acquired |  |  |  |
Accounts receivable |  | $ | 112 |  |  |
Inventory |  | 1,700 |  |  |
Prepaid expenses and other current assets |  | 126 |  |  |
Total current assets acquired |  | $ | 1,938 |  |  |
Property, plant and equipment |  | 740 |  |  |
Customer relationships |  | 270 |  |  | 1 year
Developed technology |  | 18,800 |  |  | 13 years
Trade name |  | 900 |  |  | Indefinite
Goodwill |  | 16,935 |  |  |
Other assets |  | 225 |  |  |
Total non-current assets acquired |  | 37,870 |  |  |
Total assets acquired |  | $ | 39,808 |  |  |
Liabilities Assumed |  |  |  |
Accounts payable |  | $ | 331 |  |  |
Accrued and other expenses |  | 399 |  |  |
Total liabilities assumed |  | 730 |  |  |
Estimated fair value of net assets acquired |  | $ | 39,078 |  |  |
Schedule of contingent consideration | The Company’s financial instruments remeasured and carried at fair value were as follows:
|  | September 30, 2019 |  | Level 1 |  | Level 2 |  | Level 3
Contingent consideration |  | $ | 2,800 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,800 |
Total liabilities |  | $ | 2,800 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,800 |
The following table provides a summary of changes in the fair value of the Company’s Level 3 financial instruments for the nine months ended September 30, 2019.
Balance as of December 31, 2018 |  | $ | 7,167 |
Payment of contingent consideration |  | (1,610 | )
Fair value adjustment |  | (2,757 | )
Balance as of September 30, 2019 |  | $ | 2,800 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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