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Senior convertible notes (Tables)
3 Months Ended
Mar. 31, 2016
Summary of Senior Convertible Notes

Senior convertible notes consist of the following (in thousands):

 

     March 31,
2016
     December 31,
2015
 

2018 notes

     

Principal amount

   $ 27,690       $ 27,690   

Unamortized premium

     603         660   

Unaccreted debt issuance costs

     (675      (737
  

 

 

    

 

 

 

Net carrying amount

   $ 27,618       $ 27,613