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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets Subject to Amortization | Intangible assets balances, subject to amortization, at September 30, 2018 and 2017 consisted of the following (in thousands):
| September 30, 2018 |  | September 30, 2017
| Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Purchased technology | $ | 11,749 |  |  | $ | (11,239 | ) |  | $ | 510 |  |  | $ | 11,749 |  |  | $ | (11,033 | ) |  | $ | 716 |
Schedule of Estimated Amortization Expense | Estimated amortization expense for each of the five subsequent fiscal years is expected to be (in thousands):
Years Ended September 30, | Total
2019 | $ | 177 |
2020 | 177 |
2021 | 156 |
2022 | — |
2023 | — |

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