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Intangible Assets | 12 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | INTANGIBLE ASSETS Intangible assets subject to amortization include patents and a license agreement capitalized as part of the Novartis RNAi asset acquisition in March 2015. The following table presents the components of intangible assets:
| Gross Carrying Amount |  | Accumulated Amortization |  | Impairment |  | Net Carrying Amount |  | Useful Lives
| (in thousands) |  | (in years)
As of September 30, 2023 |  |  |  |  |  |  |  |  |
Patents | $ | 21,728 |  |  | $ | 13,321 |  |  | $ | — |  |  | $ | 8,407 |  |  | 14
License | 3,129 |  |  | 1,274 |  |  | — |  |  | 1,855 |  |  | 21
Total intangible assets, net | $ | 24,857 |  |  | $ | 14,595 |  |  | $ | — |  |  | $ | 10,262 |  |  |
As of September 30, 2022 |  |  |  |  |  |  |  |  |
Patents | $ | 21,728 |  |  | $ | 11,770 |  |  | $ | — |  |  | $ | 9,958 |  |  | 14
License | 3,129 |  |  | 1,125 |  |  | — |  |  | 2,004 |  |  | 21
Total intangible assets, net | $ | 24,857 |  |  | $ | 12,895 |  |  | $ | — |  |  | $ | 11,962 |  |  |
Intangible assets are reviewed annually for impairment and more frequently if potential impairment indicators exist. No impairment indicators were identified during 2023 and 2022. Intangible assets with definite useful lives are amortized on a straight-line basis over their useful lives. Intangible assets amortization expense in each of 2023, 2022, and 2021 was $1.7 million. None of the intangible assets with definite useful lives are anticipated to have a residual value. The following table presents the estimated future amortization expense related to intangible assets as of September 30, 2023:
|  | Amortization Expense |
Year Ending September 30, |  | (in thousands) |
2024 |  | $ | 1,700 |  |
2025 |  | 1,700 |  |
2026 |  | 1,700 |  |
2027 |  | 1,700 |  |
2028 |  | 1,700 |  |
Thereafter |  | 1,762 |  |
Total |  | $ | 10,262 |  |

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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/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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