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Debt
 3 Months Ended
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 Notes2026 Notes2027 NotesTotal
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 Notes2026 Notes2027 NotesTotal
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)20232022
Contractual interest expense$2,011 $2,003 
Accretion of debt in interest expense522 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$— 
202413,750 
2025— 
2026120,000 
2027265,000 
Thereafter— 
Total$398,750