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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The total net proceeds from the notes are as follows (in thousands):
2026 Notes2025 Notes
Principal amount$1,000,000 $800,000 
Less initial purchasers’ discount(15,000)(18,998)
Less other issuance costs(904)(822)
Net proceeds$984,096 $780,180 
Schedule of Debt
The net carrying amount of the notes is as follows (in thousands):
September 30, 2023December 31, 2022
2026 Notes2025 Notes2026 Notes2025 Notes
Principal$244,479 $358,914 $500,000 $699,979 
Unamortized issuance costs(1,883)(2,219)(4,837)(6,549)
Net carrying amount$242,596 $356,695 $495,163 $693,430 
Schedule Of Interest Expense Recognized
The following table sets forth the total interest expense recognized related to the notes (in thousands):

Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
2026 notes:
Contractual interest expense$— $— $— $— 
Amortization of issuance costs238 556 873 1,863 
Total 2026 notes interest expense$238 $556 $873 $1,863 
2025 notes:
Contractual interest expense$112 $220 $510 $654 
Amortization of issuance costs384 749 1,737 2,221 
Total 2025 notes interest expense$496 $969 $2,247 $2,875