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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Carrying Value of 2018 Convertible Notes
The carrying value of the 2018 Convertible Notes as of December 31, 2016 and 2015, is summarized as follows:
 
Year Ended December 31,
 
2016

2015
Principal amount
$
110,037

 
$
120,000

(Less): Unamortized debt discount (amortized through December 2018)
(11,646
)
 
(18,452
)
(Less): Debt issuance costs (see Note 3(e))
(1,348
)
 
(2,171
)
Carrying value
$
97,043

 
$
99,377
Components of Total Interest Expense, Net Recognized
The following table sets forth the components of interest expense recognized in the accompanying Consolidated Statements of Operations for the 2018 Convertible Notes for the years ended December 31, 2016 and 2015:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Contractual coupon interest expense
$
3,288

 
$
3,300

 
$
3,300

Amortization of debt issuance costs
696

 
662

 
599

Accretion of debt discount
5,710

 
5,250

 
4,818

Total
$
9,694

 
$
9,212

 
$
8,717

Effective interest rate
8.65
%
 
8.66
%
 
8.66
%