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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets Subject to Amortization | Intangible assets balances, subject to amortization, at September 30, 2021 and 2020 consisted of the following (in thousands):
| September 30, 2021 |  | September 30, 2020
| Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Purchased technology | $ | 11,749 |  |  | $ | (11,749) |  |  | $ | — |  |  | $ | 11,749 |  |  | $ | (11,592) |  |  | $ | 157 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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