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Debt | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Debt | Debt Convertible Senior Notes 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 |
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 |
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 |
Refer to "Note 13 - Subsequent Events" about the conversion of the 2024 Notes.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//470/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I + Details
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