Convertible Subordinated Notes (Tables)
 9 Months Ended
Sep. 30, 2017
Convertible Subordinated Notes [Abstract]  
Schedule of Liability and Equity Components of Convertible Subordinated Notes
The carrying values of the liability and equity components of the Convertible Notes at December 31, 2016 and September 30, 2017 are reflected in our Consolidated Balance Sheets as follows (in thousands):
 
December 31, 2016
 
September 30, 2017
Long-term liabilities:
 
 
 
Principal amount
$
143,750

 
$
143,750

Unamortized discount of liability component
(21,887
)
 
(18,687
)
Convertible Notes issuance costs, net of accumulated amortization of $1,359 and $1,746, respectively
$
(2,268
)
 
$
(1,881
)
Carrying value of the liability component
$
119,596

 
$
123,182

 
 
 
 
Equity component carrying value
$
17,973

 
$
17,973