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Debt (Tables)
 9 Months Ended
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 Notes2026 Notes2027 NotesTotal
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 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 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)2023202220232022
Contractual interest expense$2,554 $2,011 $6,016 $6,025 
Accretion of debt in interest expense541 504 1,594 1,485 
Total interest expense$3,095 $2,515 $7,610 $7,510 
Summary of Maturities of Notes
The following table summarizes the future principal payments as of September 30, 2023:
(in thousands)
2023, remaining$— 
202413,750 
2025— 
2026120,000 
2027265,000 
Thereafter— 
Total$398,750