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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Summary of Carrying Value of Convertible Notes

The table below summarizes the carrying value of the 2021 Convertible Notes as of December 31, 2017 and 2016:

 

 

 

(in thousands)

 

Gross proceeds

 

$

52,000

 

Initial value of issuance costs recorded as debt discount

 

 

(3,262

)

Amortization of debt discount

 

 

222

 

Carrying value as of December 31, 2016

 

 

48,960

 

Amortization of debt discount

 

 

581

 

Carrying value as of December 31, 2017

 

$

49,541