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Convertible Senior Notes (Tables)
 3 Months Ended
Mar. 31, 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):
March 31, 2022December 31, 2021
2026 Notes2025 Notes2026 Notes2025 Notes
Principal$1,000,000 $699,979 $1,000,000 $699,982 
Unamortized issuance costs(11,659)(8,786)(12,309)(9,518)
Net carrying amount$988,341 $691,193 $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 March 31,
20222021
2026 notes:
Contractual interest expense$— $— 
Amortization of issuance costs650 650 
Total 2026 notes interest expense$650 $650 
2025 notes:
Contractual interest expense$215 $237 
Amortization of issuance costs732 808 
Total 2025 notes interest expense$947 $1,045 
2023 notes:
Contractual interest expense$— $66 
Amortization of issuance costs— 168 
Total 2023 notes interest expense$— $234