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Permit and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Permit and Other Intangible Assets | NOTE 5 PERMIT AND OTHER 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, 2017 |  | $ | 8,419 |
PCB permit amortized (1) |  |  | (55 | )
Permit in progress |  |  | 79 |
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 |
(1) Amortization for the one definite-lived permit capitalized in 2009 that was fully amortized in the first quarter of 2019. This permit was amortized over a ten-year period in accordance with its estimated useful life. The following table summarizes information relating to the Company’s definite-lived intangible assets:
|  | Weighted Average |  |  | December 31, 2019 |  |  | December 31, 2018 |
|  | Amortization |  |  | Gross |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  | Net |
|  | Period |  |  | Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
|  | (Years) |  |  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Intangibles (amount in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patent |  |  | 11 |  |  | $ | 760 |  |  | $ | (358 | ) |  | $ | 402 |  |  | $ | 728 |  |  | $ | (336 | ) |  | $ | 392 |
Software |  |  | 3 |  |  |  | 414 |  |  |  | (408 | ) |  |  | 6 |  |  |  | 410 |  |  |  | (403 | ) |  |  | 7 |
Customer relationships |  |  | 10 |  |  |  | 3,370 |  |  |  | (2,713 | ) |  |  | 657 |  |  |  | 3,370 |  |  |  | (2,491 | ) |  |  | 879 |
Permit |  |  | 10 |  |  |  | 545 |  |  |  | (545 | ) |  |  | ― |  |  |  | 545 |  |  |  | (538 | ) |  |  | 7 |
Total |  |  |  |  |  | $ | 5,089 |  |  | $ | (4,024 | ) |  | $ | 1,065 |  |  | $ | 5,053 |  |  | $ | (3,768 | ) |  | $ | 1,285 |
The intangible assets noted above are amortized on a straight-line basis over their useful lives with the exception of customer relationships which are being amortized using an accelerated method. The following table summarizes the expected amortization over the next five years for our definite-lived intangible assets:
|  | Amount |
Year |  | (In thousands) |
2020 |  |  | 219 |
2121 |  |  | 199 |
2022 |  |  | 173 |
2023 |  |  | 132 |
2024 |  |  | 10 |
Amortization expense recorded for definite-lived intangible assets was approximately $256,000 and $350,000, for the years ended December 31, 2019 and 2018, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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