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Permit and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Gross Carrying Amount | $ 4,530 | $ 5,089
Accumulated Amortization | (3,655) | (4,024)
Finite-Lived Intangible Assets, Net | $ 875 | 1,065
Patent [Member] |  |
Weighted Average Amortization Period (Years) | 13 years |
Gross Carrying Amount | $ 742 | 760
Accumulated Amortization | (334) | (358)
Finite-Lived Intangible Assets, Net | $ 408 | 402
Software [Member] |  |
Weighted Average Amortization Period (Years) | 3 years |
Gross Carrying Amount | $ 418 | 414
Accumulated Amortization | (411) | (408)
Finite-Lived Intangible Assets, Net | $ 7 | 6
Customer Relationships [Member] |  |
Weighted Average Amortization Period (Years) | 10 years |
Gross Carrying Amount | $ 3,370 | 3,370
Accumulated Amortization | (2,910) | (2,713)
Finite-Lived Intangible Assets, Net | 460 | 657
Permit [Member] |  |
Gross Carrying Amount |  | 545
Accumulated Amortization |  | (545)
Finite-Lived Intangible Assets, Net |  |

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