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Convertible Notes Convertible Notes (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Convertible Debt
The table below summarizes the carrying value of the 2014 Convertible Notes as of December 31, 2017 and 2016:
 
DECEMBER 31,
(in thousands)
2017
 
2016
Gross proceeds
$
125,000

 
$
125,000

Unamortized debt discount and issuance costs
(1,155
)
 
(1,461
)
Carrying value
$
123,845

 
$123,539