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Convertible Notes (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Summary of Carrying Value of Convertible Notes
The table below summarizes the carrying value of the 2014 Convertible Notes as of September 30, 2016:
 
 
 
(in thousands)
SEPTEMBER 30, 2016
Gross proceeds
$
125,000

Initial value of issuance costs recorded as debt discount
(2,147
)
Amortization of debt discount
610

Carrying value
$
123,463