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Goodwill and Intangible Assets | 12 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Our intangible assets consist of goodwill of $1.0 million, which is not being amortized, and purchased technology of $0.2 million, which is amortized over its estimated useful life. No impairment expense has been recorded for the last three fiscal years. Intangible assets balances, subject to amortization, at September 30, 2020 and 2019 consisted of the following (in thousands):
| September 30, 2020 |  | September 30, 2019
| Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Purchased technology | $ | 11,749 |  |  | $ | (11,592) |  |  | $ | 157 |  |  | $ | 11,749 |  |  | $ | (11,415) |  |  | $ | 334 |
Amortization of intangible assets recorded for the years ended September 30, 2020, 2019 and 2018 was $0.2 million, $0.2 million and $0.2 million, respectively. Estimated amortization expense for each of the five subsequent fiscal years is expected to be (in thousands):
Years Ended September 30, | Total
2021 | $ | 157 |

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- Definition The entire disclosure for goodwill and 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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