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Debt (Tables)
 9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Interest Expense Recognized Related to Convertible Notes
The following table includes total interest expense recognized related to the Convertible Notes and the 2027 Notes (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2019

2018
 
2019
 
2018
Contractual interest expense
$
8,438

 
$
9,721

 
$
26,945

 
$
30,283

Amortization of debt issuance costs
182

 
1,199

 
1,488

 
3,578

Amortization of debt discount
41

 
8,836

 
8,232

 
26,312

 
$
8,661

 
$
19,756

 
$
36,665

 
$
60,173