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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Summary of carrying values and coupon rates on financing arrangements
The following table summarizes information about the equity and liability components of the 2019 Convertible Senior Notes (in thousands).
 
June 30, 2017
 
December 31, 2016
2019 Convertible Senior Notes
 
 
 
Principal amount outstanding
$
245,000

 
$
245,000

Unamortized discount (including unamortized debt issuance cost)
(26,370
)
 
(32,090
)
Total current portion of notes payable
$
218,630

 
$
212,910