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Convertible Senior Notes (Tables) | 6 Months Ended
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Mar. 31, 2022
Debt Disclosure [Abstract] |
Schedule of Carrying Values of Company's 2026 Notes | The carrying values of the Company’s 2026 Notes are as follows (in thousands):
2026 Notes: | March 31, 2022 | September 30, 2021
Principal amount | $ | 155,250 |  | $ | 155,250 |
Less: unamortized discount and issuance costs, net of amortization | (30,880) |  | (34,332) |
Carrying amount | $ | 124,370 |  | $ | 120,918 |
2026 Notes embedded conversion derivative | $ | — |  | $ | 48,208 |
Schedule of Changes in Fair Value of Embedded Conversion Derivative | The following table includes a summary of the contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the six months ended March 31, 2022 (amounts shown in thousands):
Balance at September 30, 2021 | $ | 16,770 |
Expenses recorded due to changes in fair value | (780) |
Balance at March 31, 2022 | $ | 15,990 |
The following table presents the fair value and the change in fair value for the embedded conversion derivative (in thousands):
Embedded conversion derivative |
Fair value as of September 30, 2021 | $ | 48,208 |
Remeasurement to fair value on March 3, 2022 | (19,692) |
Impact of increase of authorized shares of common stock on convertible senior notes hedge | (28,516) |
Fair value as of March 31, 2022 | $ | — |
The remeasurement of the embedded conversion derivative to fair value on March 3, 2022 was offset by the remeasurement of the Notes Hedge. See details of the remeasurement of the Notes Hedge below.
Schedule of Interest Costs Recognized Related to 2026 Notes | The following table presents the total amount of interest cost recognized relating to the 2026 Notes (in thousands):
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2022 |  | 2021 |  | 2022 |  | 2021
Contractual interest expense | $ | 302 |  |  | $ | 172 |  |  | $ | 595 |  |  | $ | 172 |
Amortization of debt discount and issuance costs | 1,738 |  |  | 1,147 |  |  | 3,453 |  |  | 1,147 |
Total interest expense recognized | $ | 2,040 |  |  | $ | 1,319 |  |  | $ | 4,048 |  |  | $ | 1,319 |

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