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Debt (Tables)
 3 Months Ended
Mar. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Convertible Senior Notes
The fair values of the respective notes outstanding were measured based on quoted market prices.
 
March 31, 2016
 
December 31, 2015
Principal amount of Convertible Senior Notes outstanding
$
167,314

 
$
172,500

Unamortized discount of liability component
(23,767
)
 
(25,703
)
Unamortized debt issuance costs
(3,236
)
 
(3,500
)
Net carrying amount of liability component
140,311

 
143,297

Less: current portion
—

 
—

Long-term debt
$
140,311

 
$
143,297

Carrying value of equity component, net of issuance costs
$
29,211

 
$
29,758

Fair value of outstanding Convertible Senior Notes
$
149,746

 
$
170,120

Remaining amortization period of discount on the liability component
4.8 years

 
5.0 years