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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 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):
June 30, 2022December 31, 2021
2026 Notes2025 Notes2026 Notes2025 Notes
Principal$1,000,000 $699,979 $1,000,000 $699,982 
Unamortized issuance costs(11,002)(8,046)(12,309)(9,518)
Net carrying amount$988,998 $691,933 $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 June 30,Six Months Ended June 30,
2022202120222021
2026 notes:
Contractual interest expense$— $— $— $— 
Amortization of issuance costs657 657 1,307 1,307 
Total 2026 notes interest expense$657 $657 $1,307 $1,307 
2025 notes:
Contractual interest expense$219 $218 $434 $455 
Amortization of issuance costs740 740 1,472 1,548 
Total 2025 notes interest expense$959 $958 $1,906 $2,003 
2023 notes:
Contractual interest expense$— $12 $— $78 
Amortization of issuance costs— 74 — 242 
Total 2023 notes interest expense$— $86 $— $320