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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2022
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, 2022December 31, 2021
2026 Notes2025 Notes2026 Notes2025 Notes
Principal$500,000 $699,979 $1,000,000 $699,982 
Unamortized issuance costs(5,169)(7,297)(12,309)(9,518)
Net carrying amount$494,831 $692,682 $987,691 $690,464 
Schedule Of Interest Expense Recognized
The following tables set forth the total interest expense recognized related to the notes (in thousands):

Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
2026 notes:
Contractual interest expense$— $— $— $— 
Amortization of issuance costs556 663 1,863 1,970 
Total 2026 notes interest expense$556 $663 $1,863 $1,970 
2025 notes:
Contractual interest expense$220 $221 $654 $676 
Amortization of issuance costs749 749 2,221 2,297 
Total 2025 notes interest expense$969 $970 $2,875 $2,973 
2023 notes:
Contractual interest expense$— $— $— $78 
Amortization of issuance costs— — — 242 
Total 2023 notes interest expense$— $— $— $320