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Debt (Tables) | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Summary of Long-term Debt Instruments | The following table summarizes information about the net carrying amounts of long-term debt, consisting of the 4.500% Convertible Senior Notes due 2024 (the “2024 Notes”), 2.875% Convertible Senior Notes due 2026 (the “2026 Notes”), and the 1.50% Convertible Senior Notes due 2027 (the “2027 Notes”, and together with the 2024 Notes and 2026 Notes, the “Senior Notes”), as of September 30, 2023:
(in thousands) | 2024 Notes |  | 2026 Notes |  | 2027 Notes |  | Total
Principal amount of notes outstanding | $ | 13,750 |  |  | $ | 120,000 |  |  | $ | 265,000 |  |  | $ | 398,750 |
Unamortized debt issuance cost | (112) |  |  | (1,991) |  |  | (5,861) |  |  | (7,964) |
Total long-term notes payable | $ | 13,638 |  |  | $ | 118,009 |  |  | $ | 259,139 |  |  | $ | 390,786 |
The following table summarizes information about the Senior Notes as of December 31, 2022:
(in thousands) | 2024 Notes |  | 2026 Notes |  | 2027 Notes |  | Total
Principal amount of notes outstanding | $ | 13,750 |  |  | $ | 120,000 |  |  | $ | 265,000 |  |  | $ | 398,750 |
Unamortized debt issuance cost | (257) |  |  | (2,511) |  |  | (6,790) |  |  | (9,558) |
Total long-term notes payable | $ | 13,493 |  |  | $ | 117,489 |  |  | $ | 258,210 |  |  | $ | 389,192 |
Summary of Interest Expense | The following table summarizes interest expense recognized on the Senior Notes:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Contractual interest expense | $ | 2,554 |  |  | $ | 2,011 |  |  | $ | 6,016 |  |  | $ | 6,025 |
Accretion of debt in interest expense | 541 |  |  | 504 |  |  | 1,594 |  |  | 1,485 |
Total interest expense | $ | 3,095 |  |  | $ | 2,515 |  |  | $ | 7,610 |  |  | $ | 7,510 |
Summary of Maturities of Notes | The following table summarizes the future principal payments as of September 30, 2023:
(in thousands) |
2023, remaining | $ | — |
2024 | 13,750 |
2025 | — |
2026 | 120,000 |
2027 | 265,000 |
Thereafter | — |
Total | $ | 398,750 |

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