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Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Settlement of Convertible Senior Notes
The following table summarizes information about the settlement of the Convertible Senior Notes (in thousands).
 
Three month ended September 30, 2018
 
Nine months ended September 30, 2018
Principal amount settled
$
35

 
$
108,808

Number of shares of common stock issued
1

 
3,699

Loss on extinguishment of debt
$
—

 
$
2,303
Schedule of Debt
The following table summarizes information about the equity and liability components of the Convertible Senior Notes (dollars in thousands). The fair values of the respective notes outstanding were measured based on quoted market price and is a Level 2 measurement.
 
September 30, 2018
 
December 31, 2017
Principal amount outstanding
$
58,506

 
$
167,314

Unamortized discount of liability component
(4,075
)
 
(15,356
)
Unamortized debt issuance costs
(546
)
 
(2,090
)
Net carrying amount of liability component
53,885

 
149,868

Less: current portion
(53,885
)
 
—

Long-term debt
$
—

 
$
149,868

Carrying value of equity component, net of issuance costs
$
10,093

 
$
29,211

Fair value of outstanding Convertible Senior Notes
$
118,767

 
$
257,245

Remaining amortization period of discount on the liability component
2.3 years

 
3.0 years