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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Coupon Rates on Financing Arrangements
The following table summarizes information about the equity and liability components of the 2019 Notes and 2023 Notes (in thousands).
 
June 30, 2018
 
December 31, 2017
Principal amount of 2019 Notes outstanding
$
223,215

 
$
245,000

Unamortized discount (including unamortized debt issuance cost)
(12,845
)
 
(20,471
)
Total current portion of notes payable
$
210,370

 
$
224,529

 
 
 
 
Principal amount of 2023 Notes outstanding
$
750,000

 
$
—

Unamortized discount (including unamortized debt issuance cost)
(154,088
)
 
—

Total long-term portion of notes payable
$
595,912

 
$
—

Carrying value of equity component of 2023 Notes
$
143,986

 
$
—

Fair value of convertible senior notes outstanding (Level 2)
$
1,389,800

 
$
446,360