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Debt | 3 Months Ended
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Mar. 31, 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 March 31, 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 | (210) |  |  | (2,340) |  |  | (6,486) |  |  | (9,036) |
Total long-term portion of notes payable | $ | 13,540 |  |  | $ | 117,660 |  |  | $ | 258,514 |  |  | $ | 389,714 |
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 portion of notes payable | $ | 13,493 |  |  | $ | 117,489 |  |  | $ | 258,210 |  |  | $ | 389,192 |
The following tables summarize interest expense recognized on the Senior Notes for the three months ended March 31:
(in thousands) | 2023 |  | 2022
Contractual interest expense | $ | 2,011 |  |  | $ | 2,003 |
Accretion of debt in interest expense | 522 |  |  | 486 |
Total interest expense | $ | 2,533 |  |  | $ | 2,489 |
The following table summarizes the future principal payments as of March 31, 2023:
(in thousands) |
2023, remaining | $ | — |
2024 | 13,750 |
2025 | — |
2026 | 120,000 |
2027 | 265,000 |
Thereafter | — |
Total | $ | 398,750 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI https://asc.fasb.org/topic&trid=2208564 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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