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Debt (Tables) | 6 Months Ended
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Mar. 31, 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:
| March 31, 2022 |  | March 31, 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 |  |  | $ | (1,502) |  |  | $ | 142,248 |  |  | $ | 143,750 |  |  | $ | (23,443) |  |  | $ | 120,307 |  |  | $ | 143,750 |  |  | $ | (20,207) |  |  | $ | 123,543 |
2025 Convertible Notes | 172,500 |  |  | (2,580) |  |  | 169,920 |  |  | 172,500 |  |  | (35,664) |  |  | 136,836 |  |  | 172,500 |  |  | (31,857) |  |  | 140,643 |
Total long-term debt | $ | 316,250 |  |  | $ | (4,082) |  |  | $ | 312,168 |  |  | $ | 316,250 |  |  | $ | (59,107) |  |  | $ | 257,143 |  |  | $ | 316,250 |  |  | $ | (52,064) |  |  | $ | 264,186 |
The following table presents the Company's contractual maturities related to the debt instruments as of March 31, 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 |  |  | $ | — |  |  | $ | 143,750 |  |  | $ | 172,500 |  |  | $ | — |
The following table presents the Company's interest expense related to the Convertible Notes for the three and six months ended March 31, 2022 and 2021:
| Three Months Ended March 31, |  | Six Months Ended March 31,
(in thousands) | 2022 |  | 2021 |  | 2022 |  | 2021
2024 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 1,033 |  |  | $ | 1,033 |  |  | $ | 2,066 |  |  | $ | 2,066 |
Amortization of deferred financing costs | 142 |  |  | 111 |  |  | 309 |  |  | 223 |
Amortization of debt discount | — |  |  | 1,461 |  |  | — |  |  | 2,891 |
Total interest expense | $ | 1,175 |  |  | $ | 2,605 |  |  | $ | 2,375 |  |  | $ | 5,180 |
2025 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 1,024 |  |  | $ | 1,024 |  |  | $ | 2,048 |  |  | $ | 2,048 |
Amortization of deferred financing costs | 182 |  |  | 141 |  |  | 389 |  |  | 281 |
Amortization of debt discount | — |  |  | 1,712 |  |  | — |  |  | 3,391 |
Total interest expense | $ | 1,206 |  |  | $ | 2,877 |  |  | $ | 2,437 |  |  | $ | 5,720 |

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