| Schedule of Convertible Debt |
The following table presents details of our convertible senior notes, which are further discussed below (original principal in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Month Issued | | Maturity Date | | Free Convertibility Date | | Redemption Date | | Original Principal (including overallotment) | | Initial Conversion Rate per $1,000 Principal | | Initial Conversion Price | 2026 Notes | | August 2019 | | August 15, 2026 | | May 15, 2026 | | August 21, 2023 | | $ | 345,000 | | | 12.4756 | | $ | 80.16 | | 2028 Notes | | August 2023 | | August 15, 2028 | | May 15, 2028 | | August 21, 2026 | | $ | 702,000 | | | 7.4690 | | $ | 133.89 | |
The net carrying amount of the Notes was as follows (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | As of June 30, 2025 | | As of December 31, 2024 | | 2026 Notes | | 2028 Notes | | 2026 Notes | | 2028 Notes | | Principal | $ | 71,242 | | | $ | 702,000 | | | $ | 71,242 | | | $ | 702,000 | | | Unamortized issuance costs | (305) | | | (6,825) | | | (441) | | | (7,910) | | | Net carrying amount | $ | 70,937 | | | $ | 695,175 | | | $ | 70,801 | | | $ | 694,090 | |
Interest expense related to the Notes was as follows (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Three months ended June 30, | | Six months ended June 30, | | 2025 | | 2024 | | 2025 | | 2024 | | Contractual interest expense | $ | 2,394 | | | $ | 2,394 | | | $ | 4,788 | | | $ | 4,788 | | | Amortization of issuance costs | 610 | | | 609 | | | 1,220 | | | 1,217 | | Total | $ | 3,004 | | | $ | 3,003 | | | $ | 6,008 | | | $ | 6,005 | |
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