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Convertible Notes (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015:
 
 
 
(in thousands)
SEPTEMBER 30, 2015
Gross proceeds
$
125,000

Initial value of issuance costs recorded as debt discount
(875
)
Amortization of debt discount
125

Carrying value
$
124,250