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Senior convertible notes (Tables)
6 Months Ended
Jun. 30, 2016
Summary of Senior Convertible Notes

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

 

     June 30,
2016
     December 31,
2015
 

Senior Convertible notes

     

Principal amount

   $ 27,690       $ 27,690   

Unamortized premium

     545         660   

Unaccreted debt issuance costs

     (612      (737
  

 

 

    

 

 

 

Net carrying amount

   $ 27,623       $ 27,613