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Senior convertible notes (Tables)
 6 Months Ended
Jun. 30, 2015
Summary of Senior Convertible Notes

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

 

     June 30,
2015		      December 31,
2014		  

2015 notes

      

Principal amount

    $ 100,000       $ 100,000   

Unaccreted debt issuance expense

      (164 )       (645 ) 
  

 

 

     

 

 

  

Net carrying amount

    $ 99,836       $ 99,355   
  

 

 

     

 

 

  
Accretion of Debt Issuance Expense

Accretion of debt issuance expense in connection with the 2015 notes during the three and six months ended June 30, 2015 and 2014 were as follows (in thousands):

 

     Three months ended
June 30,		      Six months ended
June 30,		  
     2015      2014      2015      2014  

Accretion expense

    $ 243       $ 227       $ 481       $ 450