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Convertible Senior Notes (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The total net proceeds from the notes are as follows (in thousands):
2026 Notes2025 Notes2023 Notes
Principal amount$1,000,000 $800,000 $345,000 
Less initial purchasers’ discount(15,000)(18,998)(8,625)
Less other issuance costs(904)(822)(757)
Net proceeds$984,096 $780,180 $335,618 
Schedule of Debt
The net carrying amount of the notes is as follows (in thousands):
March 31, 2021
December 31, 2020 (1)
2026 Notes2025 Notes
2023 Notes(2)
2026 Notes2025 Notes2023 Notes
Principal$1,000,000 $699,995 $110,896 $1,000,000 $800,000 $115,576 
Unamortized debt discount— — — (226,732)(149,138)(9,953)
Unamortized issuance costs(14,294)(11,755)(1,402)(11,338)(10,248)(1,245)
Net carrying amount$985,706 $688,240 $109,494 $761,930 $640,614 $104,378 
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.
(2) As noted above, during the three months ended March 31, 2021, we elected our option to redeem the remaining outstanding principal amount of 2023 notes and we have classified the remaining net carrying amount of 2023 notes as a current liability.
Schedule Of Interest Expense Recognized
The following table sets forth the total interest expense recognized related to the notes (in thousands):
Three Months Ended March 31,
2021
2020 (1)
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Contractual interest expense$— $237 $66 $249 $215 
Amortization of debt discount— — — 8,841 3,125 
Amortization of issuance costs650 808 168 608 372 
Total interest expense$650 $1,045 $234 $9,698 $3,712 
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.