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Convertible Senior Notes (Tables)
 3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The total net proceeds from the notes are as follows (in thousands):
 
2025 Notes
 
2023 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):
 
March 31, 2020
 
December 31, 2019
 
2025 Notes
 
2023 Notes
 
2025 Notes
 
2023 Notes
Principal
$
800,000

 
$
345,000

 
$
800,000

 
$
345,000

Unamortized debt discount
(175,857
)
 
(39,155
)
 
(184,698
)
 
(42,280
)
Unamortized issuance costs
(12,084
)
 
(4,655
)
 
(12,691
)
 
(5,028
)
Net carrying amount (liability)
$
612,059

 
$
301,190

 
$
602,611

 
$
297,692

    
The net carrying amount of the equity component of the notes is as follows (in thousands):
 
March 31, 2020
 
December 31, 2019

2025 Notes
 
2023 Notes
 
2025 Notes
 
2023 Notes
Debt discount for conversion option
$
212,000

 
$
64,193

 
$
212,000

 
$
64,193

Issuance costs
(5,253
)
 
(1,749
)
 
(5,253
)
 
(1,749
)
Net carrying amount (equity)
$
206,747

 
$
62,444

 
$
206,747

 
$
62,444
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,
 
2020
 
2019
 
2025 Notes
 
2023 Notes
 
2025 Notes
 
2023 Notes
Contractual interest expense
$
249

 
$
215

 
$
14

 
$
213

Amortization of debt discount
8,841

 
3,125

 
510

 
3,091

Amortization of issuance costs
608

 
372

 
35

 
369

Total interest expense
$
9,698

 
$
3,712

 
$
559

 
$
3,673