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Senior convertible notes (Tables)
3 Months Ended
Mar. 31, 2015
Summary of Senior Convertible Notes

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

 

     March 31,
2015
     December 31,
2014
 

2015 notes

     

Principal amount

   $ 100,000       $ 100,000   

Unaccreted debt issuance expense

     (407      (645
  

 

 

    

 

 

 

Net carrying amount

$ 99,593    $ 99,355