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Convertible Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Outstanding Principal and Carrying Value
The following table presents the outstanding principal amount and carrying value of the Notes as of the date presented:
 
 
December 31, 2019
 
December 31, 2018
 
 
2017 Notes
 
2018 Notes
 
2019 Notes
 
2017 Notes
 
2018 Notes
 
 
(in thousands)
Principal amounts:
 
 
 
 
 
 
 
 
 
 
Principal
 
$
431,250

 
$
575,000

 
$
948,750

 
$
431,250

 
$
575,000

Unamortized debt discount
 
(59,830
)
 
(161,275
)
 
(277,700
)
 
(79,911
)
 
(187,435
)
Net carrying amount
 
$
371,420

 
$
413,725

 
$
671,050

 
$
351,339

 
$
387,565
Schedule Of Interest Expense Related to Notes
The following table presents total interest expense recognized related to the Notes:
 
 
December 31, 2019
 
December 31, 2018
 
December 31, 2017
 
 
2017 Notes
 
2018 Notes
 
2019 Notes
 
2017 Notes
 
2018 Notes
 
2017 Notes
 
 
(in thousands)
Contractual interest expense
 
$
1,617

 
$
6,469

 
$
3,342

 
$
1,617

 
$
1,455

 
$
1,491

Interest cost related to amortization of the debt discount
 
20,080

 
26,161

 
12,205

 
18,910

 
2,207

 
4,338

Total interest expense
 
$
21,697

 
$
32,630

 
$
15,547

 
$
20,527

 
$
3,662

 
$
5,829