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Permit and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
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 amount of permits. No permit exists at our Services and Medical Segments.
Permit (amount in thousands) |  | Treatment |
Balance as of December 31, 2016 |  | $ | 8,474 |
PCB permit amortized (1) |  |  | (55 | )
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 |
(1) Amortization for the one definite-lived permit capitalized in 2009. This permit is being amortized over a ten year period in accordance with its estimated useful life. See net carrying value of this permit at December 31, 2018 and 2017 in the table below. The following table summarizes information relating to the Company’s definite-lived intangible assets:
|  |  |  |  | December 31, 2018 |  |  | December 31, 2017 |
Intangibles (amount in thousands) |  | Useful Lives (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Patent |  |  | 1-17 |  |  | $ | 728 |  |  | $ | (336 | ) |  | $ | 392 |  |  | $ | 657 |  |  | $ | (306 | ) |  | $ | 351 |
Software |  |  | 3 |  |  |  | 410 |  |  |  | (403 | ) |  |  | 7 |  |  |  | 410 |  |  |  | (398 | ) |  |  | 12 |
Customer relationships |  |  | 10 |  |  |  | 3,370 |  |  |  | (2,491 | ) |  |  | 879 |  |  |  | 3,370 |  |  |  | (2,246 | ) |  |  | 1,124 |
Permit |  |  | 10 |  |  |  | 545 |  |  |  | (538 | ) |  |  | 7 |  |  |  | 545 |  |  |  | (483 | ) |  |  | 62 |
Total |  |  |  |  |  | $ | 5,053 |  |  | $ | (3,768 | ) |  | $ | 1,285 |  |  | $ | 4,982 |  |  | $ | (3,433 | ) |  | $ | 1,549 |
The intangible assets 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) |
2019 |  |  | $ | 255 |
2020 |  |  |  | 219 |
2021 |  |  |  | 198 |
2022 |  |  |  | 172 |
2023 |  |  |  | 132 |
Amortization expense recorded for definite-lived intangible assets was approximately $350,000 and $374,000, for the years ended December 31, 2018 and 2017, 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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