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Convertible Notes Convertible Notes (Tables)
 12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Convertible Debt
The table below summarizes the carrying value of the 2014 Convertible Notes as of December 31, 2015:
(in thousands)
 
DECEMBER 31, 2015
Gross proceeds
 
$
125,000

Initial value of issuance costs recorded as debt discount
 
(2,146
)
Amortization of debt discount and issuance costs
 
382

Carrying value
 
$
123,236