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Debt (Tables) | 3 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Schedule of Long Term Debt Instruments | The following table presents the Company's debt instruments outstanding:
| December 31, 2023 |  | December 31, 2022 |  | September 30, 2023
(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 |  |  | $ | (6,472) |  |  | $ | 223,528 |  |  | $ | 230,000 |  |  | $ | (7,351) |  |  | $ | 222,649 |  |  | $ | 230,000 |  |  | $ | (6,716) |  |  | $ | 223,284 |
2025 Convertible Notes | 103,373 |  |  | (678) |  |  | 102,695 |  |  | 103,373 |  |  | (1,181) |  |  | 102,192 |  |  | 103,373 |  |  | (810) |  |  | 102,563 |
2024 Convertible Notes | 34,389 |  |  | (82) |  |  | 34,307 |  |  | 34,389 |  |  | (246) |  |  | 34,143 |  |  | 34,389 |  |  | (124) |  |  | 34,265 |
Total | $ | 367,762 |  |  | $ | (7,232) |  |  | $ | 360,530 |  |  | $ | 367,762 |  |  | $ | (8,778) |  |  | $ | 358,984 |  |  | $ | 367,762 |  |  | $ | (7,650) |  |  | $ | 360,112 |
Less current portion | 34,389 |  |  | (82) |  |  | 34,307 |  |  | — |  |  | — |  |  | — |  |  | 34,389 |  |  | (124) |  |  | 34,265 |
Total long-term debt | $ | 333,373 |  |  | $ | (7,150) |  |  | $ | 326,223 |  |  | $ | 367,762 |  |  | $ | (8,778) |  |  | $ | 358,984 |  |  | $ | 333,373 |  |  | $ | (7,526) |  |  | $ | 325,847 |
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, 2023:
| Schedule of Contractual Maturities
(in thousands) | 2029 Convertible Notes |  | 2025 Convertible Notes |  | 2024 Convertible Notes |  | Total
Remaining 2024 | $ | — |  |  | $ | — |  |  | $ | 34,389 |  |  | $ | 34,389 |
Fiscal 2025 | — |  |  | 103,373 |  |  | — |  |  | 103,373 |
Fiscal 2026 | — |  |  | — |  |  | — |  |  | — |
Fiscal 2027 | — |  |  | — |  |  | — |  |  | — |
Fiscal 2028 | — |  |  | — |  |  | — |  |  | — |
Thereafter | 230,000 |  |  | — |  |  | — |  |  | 230,000 |
Total long-term debt | $ | 230,000 |  |  | $ | 103,373 |  |  | $ | 34,389 |  |  | $ | 367,762 |
Schedule of Interest Expense | The following table presents the Company’s interest expense related to the Convertible Notes for the three months ended December 31, 2023 and 2022:
| Three Months Ended December 31, |  |
(in thousands) | 2023 |  | 2022 |  |  |  |
2029 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 2,156 |  |  | $ | 431 |  |  |  |  |
Amortization of deferred financing costs | 244 |  |  | 52 |  |  |  |  |
Total interest expense | $ | 2,400 |  |  | $ | 483 |  |  |  |  |
2025 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 614 |  |  | $ | 942 |  |  |  |  |
Amortization of deferred financing costs | 131 |  |  | 188 |  |  |  |  |
Gain on extinguishment | — |  |  | (5,389) |  |  |  |  |
Total interest expense | $ | 745 |  |  | $ | (4,259) |  |  |  |  |
2024 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 247 |  |  | $ | 876 |  |  |  |  |
Amortization of deferred financing costs | 42 |  |  | 138 |  |  |  |  |
Loss on extinguishment | — |  |  | 8,935 |  |  |  |  |
Total interest expense | $ | 289 |  |  | $ | 9,949 |  |  |  |  |

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