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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |
Schedule of disaggregated revenue | The following table presents the Company’s revenues disaggregated by type and percentage of total revenues for the periods indicated.
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | Revenue |  | Percentage of Total Revenue |  | Revenue |  | Percentage of Total Revenue |  | Revenue |  | Percentage of Total Revenue
Sand sales revenue |  | $ | 70,902 |  |  | 58 | % |  | $ | 109,621 |  |  | 47 | % |  | $ | 143,533 |  |  | 68 | %
Shortfall revenue |  | 23,281 |  |  | 19 | % |  | 49,259 |  |  | 21 | % |  | 6,032 |  |  | 3 | %
Logistics revenue |  | 28,157 |  |  | 23 | % |  | 74,193 |  |  | 32 | % |  | 62,905 |  |  | 30 | %
Total revenues |  | $ | 122,340 |  |  | 100 | % |  | $ | 233,073 |  |  | 100 | % |  | $ | 212,470 |  |  | 101 | %
Schedule Of Useful Life Property Plant And Equipment | Depreciation is calculated using the straight-line method over the estimated useful lives of the property, plant and equipment, which are:
| Years
Land improvements | 10
Plant and buildings | 5-15
Real estate properties | 10-40
Railroad and sidings | 30
Vehicles | 3-5
Machinery, equipment and tooling | 3-15
SmartSystems | 5-15
Furniture and fixtures | 3-10
Deferred mining costs | 3
Schedule of contingent consideration | The fair value of the Company’s financial instruments carried at fair value were as follows:
|  | December 31, 2020 |  | Level 1 |  | Level 2 |  | Level 3
Contingent consideration |  | $ | 180 |  |  | $ | — |  |  | $ | — |  |  | $ | 180 |
Total liabilities |  | $ | 180 |  |  | $ | — |  |  | $ | — |  |  | $ | 180 |
Fair value, liabilities measured on recurring basis, unobservable input reconciliation | The following table provides a summary of changes in the fair value of the Company’s Level 3 financial instruments for the year ended December 31, 2020:
Balance as of December 31, 2019 |  | $ | 1,900 |
Payment of contingent consideration |  | (310) |
Fair value adjustment |  | (1,410) |
Balance as of December 31, 2020 |  | $ | 180 |
Reconciliation of weighted-average common shares outstanding used in the calculation of basic and diluted net income (loss) per share | The following table reconciles the weighted-average common shares outstanding used in the calculation of basic net income per share to the weighted average common shares outstanding used in the calculation of diluted net income per share:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Weighted average common shares outstanding | 40,260 |  |  | 40,135 |  |  | 40,427 |
Assumed conversion of restricted stock | — |  |  | 202 |  |  | 22 |
Diluted weighted average common stock outstanding | 40,260 |  |  | 40,337 |  |  | 40,449 |
Schedule of finite-lived intangible assets | Acquired finite-lived intangible assets are amortized on a straight-line basis over the following periods:
|  | Estimated Useful Life (Years)
Developed technology |  | 13
In 2020, the Company recorded an impairment loss of $5,115 to fully write down the value of its long-lived assets in the Permian basin as it has no intentions to develop these properties in the foreseeable future. The following table reflects the changes in the net carrying amounts of the Company’s intangible assets for the year ended December 31, 2020.
|  | Balance at December 31, 2019 |  | Assets Acquired Pursuant to Business Combination |  | Impairment Charges |  | Amortization Expense |  | Balance at December 31, 2020
Developed technology |  | $ | 9,046 |  |  | $ | — |  |  | $ | — |  |  | $ | 793 |  |  | $ | 8,253 |
|  | $ | 9,046 |  |  | $ | — |  |  | $ | — |  |  | $ | 793 |  |  | $ | 8,253 |
| The following table reflects the changes in the net carrying amounts of the Company’s finite-lived intangible assets for the year ended December 31, 2019.
|  | Balance at December 31, 2018 |  | Assets Acquired Pursuant to Business Combination |  | Impairment Charges |  | Amortization Expense |  | Balance at December 31, 2019
Developed technology |  | $ | 17,956 |  |  | $ | — |  |  | $ | 7,628 |  |  | $ | 1,282 |  |  | $ | 9,046 |
Customer relationships |  | 112 |  |  | — |  |  | — |  |  | 112 |  |  | — |
|  | $ | 18,068 |  |  | $ | — |  |  | $ | 7,628 |  |  | $ | 1,394 |  |  | $ | 9,046 |

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