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Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | 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 |  |  |
Schedule of Intangible Assets Future Amortization Expense | 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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