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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2020
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 liability component of the notes is as follows (in thousands):
September 30, 2020December 31, 2019
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Principal$1,000,000 $800,000 $173,018 $800,000 $345,000 
Unamortized debt discount(236,809)(158,077)(16,484)(184,698)(42,280)
Unamortized issuance costs(11,842)(10,862)(1,960)(12,691)(5,028)
Net carrying amount (liability)$751,349 $631,061 $154,574 $602,611 $297,692 
    
The net carrying amount of the equity component of the notes is as follows (in thousands):
September 30, 2020December 31, 2019
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Debt discount for conversion option$241,300 $212,000 $32,193 $212,000 $64,193 
Issuance costs(3,838)(5,253)(877)(5,253)(1,749)
Net carrying amount (equity)$237,462 $206,747 $31,316 $206,747 $62,444 
Schedule Of Interest Expense Recognized The following tables set forth the total interest expense recognized related to the notes (in thousands):
Three Months Ended September 30,
20202019
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Contractual interest expense$— $252 $169 $252 $217 
Amortization of debt discount4,491 8,938 2,458 8,939 3,161 
Amortization of issuance costs225 614 292 614 375 
Total interest expense$4,716 $9,804 $2,919 $9,805 $3,753 

Nine Months Ended September 30,
20202019
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Contractual interest expense$— $750 $599 $517 $645 
Amortization of debt discount4,491 26,621 8,709 18,363 9,377 
Amortization of issuance costs225 1,829 1,035 1,262 1,112 
Total interest expense$4,716 $29,200 $10,343 $20,142 $11,134