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Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Summary of Net Carrying Amount of Liability and Equity Component of 2025 Notes | The net carrying amount of the liability component of the 2025 Notes was as follows (in thousands):
| June 30, 2022 |  | December 31, 2021
Convertible senior notes, net: |  |  |
Principal | $ | 747,496 |  |  | $ | 747,500 |
Unamortized debt issuance costs | (10,336) |  |  | (12,018) |
Net carrying amount | $ | 737,160 |  |  | $ | 735,482 |
Interest Expense related to 2025 Notes | The following table sets forth the interest expense related to the 2025 Notes (in thousands):
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30,
| 2022 |  | 2021 |  |  |  | 2022 |  | 2021
Contractual interest expense | $ | 233 |  |  | $ | 233 |  |  |  |  | $ | 467 |  |  | $ | 467 |
Amortization of issuance costs | 842 |  |  | 837 |  |  |  |  | 1,682 |  |  | 1,672 |
Total | $ | 1,075 |  |  | $ | 1,070 |  |  |  |  | $ | 2,149 |  |  | $ | 2,139 |

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