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Convertible Subordinated Notes (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Convertible Subordinated Notes, Carrying Values of Liability and Equity Components
The carrying values of the liability and equity components of the Convertible Notes at December 31, 2015 and 2016 are reflected on our Consolidated Balance Sheets as follows (in thousands):
 
December 31, 2015
 
December 31, 2016
Long-term liabilities:
 
 
 
Principal amount
$
143,750

 
$
143,750

Unamortized discount of liability component
(25,754
)
 
(21,887
)
Convertible Notes issuance costs, net of accumulated amortization of $858 and $1,359, respectively
(2,769
)
 
(2,268
)
Carrying value of the liability component
$
115,227

 
$
119,596

 
 
 
 
Equity component carrying value
$
17,973

 
$
17,973
Schedule of Maturities of Long-term Debt
Beginning January 1, 2016, debt issuance costs are retroactively reflected as a direct deduction from the carrying value of the relat
The aggregate maturities of our Convertible Notes for the five years subsequent to December 31, 2016 and thereafter are as follows (in thousands):
 
 
Principal Maturity
 
Discount Amortization
 
Present
 Value
Years ending December 31,
 
 
 
 
 
 
2017
 
$
—

 
$
(4,328
)
 
$
(4,328
)
2018
 
—

 
(4,844
)
 
(4,844
)
2019
 
—

 
(5,422
)
 
(5,422
)
2020
 
—

 
(6,068
)
 
(6,068
)
2021
 
143,750

 
(1,225
)
 
142,525

 
 
$
143,750

 
$
(21,887
)
 
$
121,863