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Acquisitions (Tables) | 6 Months Ended
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Jun. 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:
| 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 |
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 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 contingent consideration | The Company’s financial instruments remeasured and carried at fair value were as follows:
|  | June 30, 2019 |  | Level 1 |  | Level 2 |  | Level 3
Contingent consideration |  | $ | 4,400 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,400 |
Total liabilities |  | $ | 4,400 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,400 |

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