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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 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):
June 30, 2021
December 31, 2020 (1)
2026 Notes2025 Notes2026 Notes2025 Notes2023 Notes
Principal$1,000,000 $699,992 $1,000,000 $800,000 $115,576 
Unamortized debt discount— — (226,732)(149,138)(9,953)
Unamortized issuance costs(13,637)(11,015)(11,338)(10,248)(1,245)
Net carrying amount$986,363 $688,977 $761,930 $640,614 $104,378 
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.
Schedule Of Interest Expense Recognized
The following tables set forth the total interest expense recognized related to the notes (in thousands):
Three Months Ended June 30,
2021
2020 (1)
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Contractual interest expense$— $218 $12 $249 $215 
Amortization of debt discount— — — 8,842 3,126 
Amortization of issuance costs657 740 74 607 371 
Total interest expense$657 $958 $86 $9,698 $3,712 
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.
Six Months Ended June 30,
2021
2020 (1)
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Contractual interest expense$— $455 $78 $498 $430 
Amortization of debt discount— — — 17,683 6,251 
Amortization of issuance costs1,307 1,548 242 1,215 743 
Total interest expense$1,307 $2,003 $320 $19,396 $7,424 
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.