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Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2022
Carrying Value of Convertible Senior Notes | The net carrying value of the liability component of the 2019 Notes is as follows:
|  | September 30, 2022 |  |  | December 31, 2021 |
|  | (Amounts in thousands) |
0.375% Convertible Senior Notes due 2024: |  |  |  |  |  |
Principal amount |  | $ | 287,475 |  |  | $ | 287,489 |
Unamortized debt discount |  |  | — |  |  |  | (28,220 | )
Unamortized debt issuance costs |  |  | (3,310 | ) |  |  | (4,011 | )
Net carrying amount |  | $ | 284,165 |  |  | $ | 255,258 |
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, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | (Amounts in thousands) |
Contractual interest expense |  | $ | 270 |  |  | $ | 270 |  |  | $ | 809 |  |  | $ | 809 |
Amortization of debt issuance costs |  |  | 455 |  |  |  | 361 |  |  |  | 1,360 |  |  |  | 1,070 |
Amortization of debt discount |  |  | — |  |  |  | 2,540 |  |  |  | — |  |  |  | 7,526 |
Total |  | $ | 725 |  |  | $ | 3,171 |  |  | $ | 2,169 |  |  | $ | 9,405 |
Effective interest rate of the liability component |  |  | 1.0 | % |  |  | 5.1 | % |  |  | 1.0 | % |  |  | 5.1 | %

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- Definition Schedule of convertiable note interest expense + References No definition available. + Details
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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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