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Debt (Tables) | 3 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Schedule of Long Term Debt Instruments | The following table presents the Company's debt instruments outstanding:
| December 31, 2022 |  | December 31, 2021 |  | September 30, 2022
(in thousands) | Gross Amount |  | Debt Issuance Costs |  | Carrying Amount |  | Gross Amount |  | Debt Issuance Costs |  | Carrying Amount |  | Gross Amount |  | Debt Issuance Costs |  | Carrying Amount
2029 Convertible Notes | $ | 230,000 |  |  | $ | (7,351) |  |  | $ | 222,649 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
2025 Convertible Notes | 103,373 |  |  | (1,181) |  |  | 102,192 |  |  | 172,500 |  |  | (2,762) |  |  | 169,738 |  |  | 172,500 |  |  | (2,172) |  |  | 170,328 |
2024 Convertible Notes | 34,389 |  |  | (246) |  |  | 34,143 |  |  | 143,750 |  |  | (1,644) |  |  | 142,106 |  |  | 143,750 |  |  | (1,175) |  |  | 142,575 |
Total long-term debt | $ | 367,762 |  |  | $ | (8,778) |  |  | $ | 358,984 |  |  | $ | 316,250 |  |  | $ | (4,406) |  |  | $ | 311,844 |  |  | $ | 316,250 |  |  | $ | (3,347) |  |  | $ | 312,903 |
Schedule of Maturities of Long-Term Debt | The following table presents the Company's contractual maturities related to the debt instruments as of December 31, 2022:
| Schedule of Contractual Maturities
(in thousands) | 2029 Convertible Notes |  | 2025 Convertible Notes |  | 2024 Convertible Notes |  | Total
Remaining 2023 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Fiscal 2024 | — |  |  | — |  |  | 34,389 |  |  | 34,389 |
Fiscal 2025 | — |  |  | 103,373 |  |  | — |  |  | 103,373 |
Fiscal 2026 | — |  |  | — |  |  | — |  |  | — |
Fiscal 2027 | — |  |  | — |  |  | — |  |  | — |
Thereafter | 230,000 |  |  | — |  |  | — |  |  | 230,000 |
Total long-term debt | $ | 230,000 |  |  | $ | 103,373 |  |  | $ | 34,389 |  |  | $ | 367,762 |
Schedule of Interest Income and Interest Expense Disclosure | The following table presents the Company's interest expense related to the Convertible Notes for the three months ended December 31, 2022 and 2021:
| Three Months Ended December 31, |  |
(in thousands) | 2022 |  | 2021 |  |  |  |
2029 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 431 |  |  | $ | — |  |  |  |  |
Amortization of deferred financing costs | 52 |  |  | — |  |  |  |  |
Total interest expense | $ | 483 |  |  | $ | — |  |  |  |  |
2025 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 942 |  |  | $ | 1,024 |  |  |  |  |
Amortization of deferred financing costs | 188 |  |  | 207 |  |  |  |  |
Total interest expense | $ | 1,130 |  |  | $ | 1,231 |  |  |  |  |
2024 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 876 |  |  | $ | 1,033 |  |  |  |  |
Amortization of deferred financing costs | 138 |  |  | 167 |  |  |  |  |
Total interest expense | $ | 1,014 |  |  | $ | 1,200 |  |  |  |  |

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