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Debt - Table (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt |  |
Principal | $ 550,484 | $ 558,728
Unaccreted Discount | (111,200) | (115,366)
Debt Issuance Costs | (7,052) | (7,623)
Carrying Value | 432,232 | 435,739
Convertible senior notes, due 2026 |  |
Debt |  |
Principal | 217,000 | 225,000
Unaccreted Discount | 0 | 0
Debt Issuance Costs | (2,903) | (3,311)
Carrying Value | 214,097 | 221,689
Convertible senior notes, due 2028 |  |
Debt |  |
Principal | 333,334 | 333,334
Unaccreted Discount | (111,191) | (115,353)
Debt Issuance Costs | (4,149) | (4,312)
Carrying Value | 217,994 | 213,669
Advance funding arrangement |  |
Debt |  |
Principal |  | 94
Unaccreted Discount |  | 0
Debt Issuance Costs |  | 0
Carrying Value |  | 94
Other notes |  |
Debt |  |
Principal | 150 | 300
Unaccreted Discount | (9) | (13)
Debt Issuance Costs | 0 | 0
Carrying Value | $ 141 | $ 287

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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