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Convertible Senior Notes (Tables)
 3 Months Ended
Mar. 31, 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).
 
March 31, 2017
 
December 31, 2016
2019 Convertible Senior Notes
 
 
 
Principal amount outstanding
$
245,000

 
$
245,000

Unamortized discount
(29,252
)
 
(32,090
)
Total current portion of notes payable
$
215,748

 
$
212,910