| Summary of Convertible Notes |
The Convertible Notes consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As of December 31, | | 2024 | | 2023 | | Principal | | Unamortized Debt Issuance Costs | | Net Carrying Amount | | Principal | | Unamortized Debt Issuance Costs | | Net Carrying Amount | | | | | | | | | | | | | | (in thousands) | | 2025 Notes | $ | 36,240 | | | $ | (28) | | | $ | 36,212 | | | $ | 284,105 | | | $ | (871) | | | $ | 283,234 | | | 2026 Notes | 249,754 | | | (624) | | | 249,130 | | | 838,482 | | | (3,402) | | | 835,080 | | | 2027 Notes | 1,150,000 | | | (4,984) | | | 1,145,016 | | | 1,150,000 | | | (7,114) | | | 1,142,886 | | | 2028 Notes | 1,500,000 | | | (8,982) | | | 1,491,018 | | | 1,500,000 | | | (11,800) | | | 1,488,200 | | 2030 Notes | 750,000 | | | (27,447) | | | 722,553 | | | — | | — | | — | | Total | $ | 3,685,994 | | | $ | (42,065) | | | $ | 3,643,929 | | | $ | 3,772,587 | | | $ | (23,187) | | | $ | 3,749,400 | |
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| Schedule of Debt |
The following table summarizes interest expense related to the Convertible Notes: | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | 2024 | | 2023 | | 2022 | | | | | | | | (in thousands) | | Contractual interest expense | $ | 7,334 | | | $ | 8,874 | | | $ | 8,655 | | | Amortization of debt issuance costs | 8,906 | | 6,880 | | 6,543 | | Total interest expense | $ | 16,240 | | | $ | 15,754 | | | $ | 15,198 | |
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