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Convertible Senior Notes (Tables) | 3 Months Ended
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Dec. 31, 2021
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):
| December 31, 2021
2026 Notes: |
Principal amount | $ | 155,250 |
Less: unamortized discount and issuance costs, net of amortization | (32,618) |
Carrying amount | $ | 122,632 |
2026 Notes embedded conversion derivative | $ | 42,821 |
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 three months ended December 31, 2021 (amounts shown in thousands):
Balance at September 30, 2021 | $ | 16,770 |
Expenses recorded due to changes in fair value | 30 |
Balance at December 31, 2021 | $ | 16,800 |
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 |
Change in fair value | (5,387) |
Fair value as of December 31, 2021 | $ | 42,821 |
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 December 31, |  |
| 2021 |  | 2020 |  |  |  |
Contractual interest expense | $ | 293 |  |  | $ | — |  |  |  |  |
Amortization of debt discount and issuance costs | 1,715 |  |  | — |  |  |  |  |
Total interest expense recognized | $ | 2,008 |  |  | $ | — |  |  |  |  |

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