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Intangible Assets | 9 Months Ended
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Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 8. Intangible Assets Intangible assets consist principally of acquired patents and technology, customer lists and relationships, licenses, and trademarks. Intangible asset amortization expense was $0.6 million and $0.7 million for the three months ended June 30, 2020 and 2019, respectively, and $1.8 million and $2.0 million for the nine months ended June 30, 2020 and 2019, respectively. Intangible assets consisted of the following:
|  | June 30, 2020 |
(Dollars in thousands) |  | Weighted Average Original Life (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
Definite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer lists and relationships |  |  | 8.9 |  |  | $ | 17,698 |  |  | $ | (11,847 | ) |  | $ | 5,851 |
Developed technology |  |  | 11.5 |  |  |  | 9,565 |  |  |  | (3,904 | ) |  |  | 5,661 |
Non-compete |  |  | 5.0 |  |  |  | 230 |  |  |  | (230 | ) |  |  | — |
Patents and other |  |  | 16.5 |  |  |  | 2,321 |  |  |  | (1,828 | ) |  |  | 493 |
Total definite-lived intangible assets |  |  |  |  |  |  | 29,814 |  |  |  | (17,809 | ) |  |  | 12,005 |
Unamortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks and trade names |  |  |  |  |  |  | 580 |  |  |  | — |  |  |  | 580 |
Total intangible assets |  |  |  |  |  | $ | 30,394 |  |  | $ | (17,809 | ) |  | $ | 12,585 |
|  | September 30, 2019 |
(Dollars in thousands) |  | Weighted Average Original Life (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
Definite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer lists and relationships |  |  | 8.9 |  |  | $ | 17,374 |  |  | $ | (10,661 | ) |  | $ | 6,713 |
Developed technology |  |  | 11.5 |  |  |  | 9,490 |  |  |  | (3,196 | ) |  |  | 6,294 |
Non-compete |  |  | 5.0 |  |  |  | 230 |  |  |  | (196 | ) |  |  | 34 |
Patents and other |  |  | 16.5 |  |  |  | 2,321 |  |  |  | (1,716 | ) |  |  | 605 |
Total definite-lived intangible assets |  |  |  |  |  |  | 29,415 |  |  |  | (15,769 | ) |  |  | 13,646 |
Unamortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks and trade names |  |  |  |  |  |  | 580 |  |  |  | — |  |  |  | 580 |
Total intangible assets |  |  |  |  |  | $ | 29,995 |  |  | $ | (15,769 | ) |  | $ | 14,226 |
Based on the intangible assets in service as of June 30, 2020, estimated amortization expense for the remainder of fiscal 2020 and each of the next five fiscal years is as follows (in thousands):
Remainder of 2020 |  | $ | 591 |
2021 |  |  | 2,321 |
2022 |  |  | 2,281 |
2023 |  |  | 1,701 |
2024 |  |  | 1,612 |
2025 |  |  | 1,575 |
Future amortization amounts presented above are estimates. Actual future amortization expense may be different as a result of future acquisitions, impairments, changes in amortization periods, foreign currency translation rates, or other factors.

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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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