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Debt (Tables) | 9 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Schedule of Long Term Debt Instruments | The Company adopted ASU 2020-06 on October 1, 2021. See Note 1: Organization And Summary Of Significant Accounting Policies for further discussion of this recently adopted accounting policy. The following table presents the Company's debt instruments outstanding:
| June 30, 2022 |  | June 30, 2021 |  | September 30, 2021
(in thousands) | Gross Amount |  | Debt Issuance Costs |  | Carrying Amount |  | Gross Amount |  | Debt Discount and Issuance Costs |  | Carrying Amount |  | Gross Amount |  | Debt Discount and Issuance Costs |  | Carrying Amount
2024 Convertible Notes | $ | 143,750 |  |  | $ | (1,346) |  |  | $ | 142,404 |  |  | $ | 143,750 |  |  | $ | (21,840) |  |  | $ | 121,910 |  |  | $ | 143,750 |  |  | $ | (20,207) |  |  | $ | 123,543 |
2025 Convertible Notes | 172,500 |  |  | (2,383) |  |  | 170,117 |  |  | 172,500 |  |  | (33,778) |  |  | 138,722 |  |  | 172,500 |  |  | (31,857) |  |  | 140,643 |
Total long-term debt | $ | 316,250 |  |  | $ | (3,729) |  |  | $ | 312,521 |  |  | $ | 316,250 |  |  | $ | (55,618) |  |  | $ | 260,632 |  |  | $ | 316,250 |  |  | $ | (52,064) |  |  | $ | 264,186 |
The following table presents the Company's contractual maturities related to the debt instruments as of June 30, 2022:
| Schedule of Contractual Maturities
(in thousands) | Total |  | Less Than 1 Year |  | 1 - 3 Years |  | 3 - 5 Years |  | More Than 5 Years
2024 Convertible Notes | $ | 143,750 |  |  | $ | — |  |  | $ | 143,750 |  |  | $ | — |  |  | $ | — |
2025 Convertible Notes | 172,500 |  |  | — |  |  | 172,500 |  |  | — |  |  | — |
| $ | 316,250 |  |  | $ | — |  |  | $ | 316,250 |  |  | $ | — |  |  | $ | — |
The following table presents the Company's interest expense related to the Convertible Notes for the three and nine months ended June 30, 2022 and 2021:
| Three Months Ended June 30, |  | Nine Months Ended June 30,
(in thousands) | 2022 |  | 2021 |  | 2022 |  | 2021
2024 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 1,033 |  |  | $ | 1,033 |  |  | $ | 3,099 |  |  | $ | 3,100 |
Amortization of deferred financing costs | 156 |  |  | 112 |  |  | 465 |  |  | 335 |
Amortization of debt discount | — |  |  | 1,490 |  |  | — |  |  | 4,381 |
Total interest expense | $ | 1,189 |  |  | $ | 2,635 |  |  | $ | 3,564 |  |  | $ | 7,816 |
2025 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 1,025 |  |  | $ | 1,024 |  |  | $ | 3,073 |  |  | $ | 3,073 |
Amortization of deferred financing costs | 197 |  |  | 139 |  |  | 586 |  |  | 420 |
Amortization of debt discount | — |  |  | 1,747 |  |  | — |  |  | 5,138 |
Total interest expense | $ | 1,222 |  |  | $ | 2,910 |  |  | $ | 3,659 |  |  | $ | 8,631 |

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