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Debt (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017
 
December 31, 2016
Principal amount of Convertible Senior Notes outstanding
$
167,314

 
$
167,314

Unamortized discount of liability component
(19,020
)
 
(20,221
)
Unamortized debt issuance costs
(2,589
)
 
(2,753
)
Net carrying amount of liability component
145,705

 
144,340

Less: current portion
—

 
—

Long-term debt
$
145,705

 
$
144,340

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

 
$
29,211

Fair value of outstanding Convertible Senior Notes
$
170,961

 
$
165,223

Remaining amortization period of discount on the liability component
3.8 years

 
4.0 years