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Intangible Assets | 12 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The following is a summary of intangible assets:
|  |  | Years Ended September 30,
|  |  | 2017 |  | 2016
| Useful Life |  | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount |  | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount
|  |  | (dollars in thousands)
Customer lists | 6-10 years |  | $ | 2,471 |  | $ | (1,521 | ) | $ | 950 |  |  | $ | 2,432 |  | $ | (1,164 | ) | $ | 1,268 |
Technology | 5-10 years |  | 3,386 |  | (2,024 | ) | 1,362 |  |  | 3,214 |  | (1,678 | ) | 1,536 |
Trade names | 10-15 Years |  | 1,468 |  | (285 | ) | 1,183 |  |  | 1,455 |  | (219 | ) | 1,236 |
Other | 2-10 years |  | 78 |  | (78 | ) | — |  |  | 277 |  | (217 | ) | 60 |
|  |  | $ | 7,403 |  | $ | (3,908 | ) | $ | 3,495 |  |  | $ | 7,378 |  | $ | (3,278 | ) | $ | 4,100 |
Amortization expense related to intangible assets was $0.8 million, $0.8 million and $1.2 million in 2017, 2016 and 2015, respectively. The aggregate amortization expense for the intangible assets for each of the five succeeding fiscal years is estimated to be $0.6 million, $0.6 million, $0.6 million, $0.4 million, $0.3 million and $1.2 million in 2018, 2019, 2020, 2021, 2022 and thereafter, respectively. On December 24, 2014, we acquired a 51% controlling interest in SoLayTec. The intangible assets of SoLayTec total $2.1 million, of which $1.9 million is included in “Technology” and $0.2 million is included in “Trade names” in the table above. On January 30, 2015, we completed the merger with BTU. The intangible assets of BTU total $2.9 million, of which $1.2 million is included in “Trade names” and $1.7 million is included in “Customer lists” in the table above. See Note 12, “Acquisitions,” for more information regarding the acquisition of SoLayTec and the merger with BTU. As a result of the sale of our partial ownership in Kingstone in 2015, we derecognized $3.2 million of intangible assets and $1.9 million of accumulated amortization. See Note 13, “Deconsolidation,” for additional details.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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