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Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Summary of Carrying Value of Convertible Notes
The table below summarizes the carrying value of the 2014 Convertible Notes as of December 31, 2017:
 
(in thousands)
DECEMBER 31, 2017
Gross proceeds
$
125,000

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