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

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