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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The total net proceeds from the notes are as follows (in thousands):
2025 Notes2023 Notes
Principal amount$800,000  $345,000  
Less initial purchasers’ discount(18,998) (8,625) 
Less other issuance costs(822) (757) 
Net proceeds$780,180  $335,618  
Schedule of Debt
The net carrying amount of the liability component of the notes is as follows (in thousands):
June 30, 2020December 31, 2019
2025 Notes2023 Notes2025 Notes2023 Notes
Principal$800,000  $344,998  $800,000  $345,000  
Unamortized debt discount(167,016) (36,029) (184,698) (42,280) 
Unamortized issuance costs(11,476) (4,284) (12,691) (5,028) 
Net carrying amount (liability)$621,508  $304,685  $602,611  $297,692  
        
The net carrying amount of the equity component of the notes is as follows (in thousands):
June 30, 2020December 31, 2019
2025 Notes2023 Notes2025 Notes2023 Notes
Debt discount for conversion option$212,000  $64,192  $212,000  $64,193  
Issuance costs(5,253) (1,749) (5,253) (1,749) 
Net carrying amount (equity)$206,747  $62,443  $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 June 30,
20202019
2025 Notes2023 Notes2025 Notes2023 Notes
Contractual interest expense$249  $215  $251  $215  
Amortization of debt discount8,842  3,126  8,914  3,125  
Amortization of issuance costs607  371  613  368  
Total interest expense$9,698  $3,712  $9,778  $3,708  

Six Months Ended June 30,
20202019
2025 Notes2023 Notes2025 Notes2023 Notes
Contractual interest expense$498  $430  $265  $428  
Amortization of debt discount17,683  6,251  9,424  6,216  
Amortization of issuance costs1,215  743  648  737  
Total interest expense$19,396  $7,424  $10,337  $7,381