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Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Carrying Value of Convertible Senior Notes | The net carrying value of the liability component of the 2019 Notes is as follows:
|  | September 30, 2023 |  |  | December 31, 2022 |
|  | (Amounts in thousands) |
0.375% Convertible Senior Notes due 2024: |  |  |  |  |  |
Principal amount |  | $ | 287,437 |  |  | $ | 287,470 |
Unamortized debt issuance costs |  |  | (1,481 | ) |  |  | (2,855 | )
Net carrying amount |  | $ | 285,956 |  |  | $ | 284,615 |
Schedule of convertiable note interest expense | The following table sets forth total interest expense recognized related to the 2019 Notes:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
|  | (Amounts in thousands) |
Contractual interest expense |  | $ | 269 |  |  | $ | 270 |  |  | $ | 808 |  |  | $ | 809 |
Amortization of debt issuance costs |  |  | 459 |  |  |  | 455 |  |  |  | 1,373 |  |  |  | 1,360 |
Total |  | $ | 728 |  |  | $ | 725 |  |  | $ | 2,181 |  |  | $ | 2,169 |
Effective interest rate of the liability component |  |  | 1.0 | % |  |  | 1.0 | % |  |  | 1.0 | % |  |  | 1.0 | %

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