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Intangible Assets | 12 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Intangible assets consist of the following (in thousands):
|  |  | Years Ended September 30,
|  |  | 2018 |  | 2017
| Useful Life |  | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount |  | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount
Customer lists | 6-10 years |  | $ | 1,219 |  | $ | (745 | ) | $ | 474 |  |  | $ | 2,471 |  | $ | (1,521 | ) | $ | 950 |
Technology | 5-10 years |  | — |  | — |  | — |  |  | 3,386 |  | (2,024 | ) | 1,362 |
Trade names | 10-15 Years |  | 869 |  | (213 | ) | 656 |  |  | 1,468 |  | (285 | ) | 1,183 |
Other | 2-10 years |  | — |  | — |  | — |  |  | 78 |  | (78 | ) | — |
|  |  | $ | 2,088 |  | $ | (958 | ) | $ | 1,130 |  |  | $ | 7,403 |  | $ | (3,908 | ) | $ | 3,495 |
We conducted our periodic assessment of long-lived assets in the fourth quarter of fiscal 2018 and identified the need for an intangible asset impairment charge in our Solar segment of $1.3 million due primarily to the decline in our expected performance of that segment. All remaining intangible assets are included in our Semiconductor segment. Amortization expense related to intangible assets was $0.2 million, $0.8 million and $0.8 million in 2018, 2017 and 2016, respectively. The aggregate amortization expense for the intangible assets for each of the five succeeding fiscal years is estimated to be $0.3 million, $0.3 million, $0.1 million, $0.1 million, $0.1 million and $0.2 million in 2019, 2020, 2021, 2022, 2023 and thereafter, 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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