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Permit and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | The following table summarizes changes in the carrying value of permits. No permit exists at our Services and Medical Segments.
Permit (amount in thousands) |  | Treatment |
Balance as of December 31, 2018 |  | $ | 8,443 |
PCB permit amortized (1) |  |  | (7 | )
Permit in progress |  |  | 354 |
Balance as of December 31, 2019 |  |  | 8,790 |
Permit in progress |  |  | 132 |
Balance as of December 31, 2020 |  | $ | 8,922 |
Schedule of Finite-Lived Intangible Assets | The following table summarizes information relating to the Company’s definite-lived intangible assets:
|  | Weighted Average |  |  | December 31, 2020 |  |  | December 31, 2019 |
|  | Amortization |  |  | Gross |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  | Net |
Intangibles (amount in |  | Period |  |  | Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
thousands) |  | (Years) |  |  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Patent |  | 13 |  |  | $ | 742 |  |  | $ | (334 | ) |  | $ | 408 |  |  | $ | 760 |  |  | $ | (358 | ) |  | $ | 402 |
Software |  | 3 |  |  |  | 418 |  |  |  | (411 | ) |  |  | 7 |  |  |  | 414 |  |  |  | (408 | ) |  |  | 6 |
Customer relationships |  | 10 |  |  |  | 3,370 |  |  |  | (2,910 | ) |  |  | 460 |  |  |  | 3,370 |  |  |  | (2,713 | ) |  |  | 657 |
Permit |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 545 |  |  |  | (545 | ) |  |  | — |
Total |  |  |  |  | $ | 4,530 |  |  | $ | (3,655 | ) |  | $ | 875 |  |  | $ | 5,089 |  |  | $ | (4,024 | ) |  | $ | 1,065 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The following table summarizes the expected amortization over the next five years for our definite-lived intangible assets:
|  | Amount |
Year |  | (In thousands) |
2021 |  |  | 199 |
2022 |  |  | 172 |
2023 |  |  | 132 |
2024 |  |  | 11 |
2025 |  |  | 11 |

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