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Liability Related to Sale of Future Royalties (Tables)
 12 Months Ended
Dec. 31, 2014
Text Block [Abstract]  
Summary of Liability Related to Potential Future Royalties

The following table shows the activity within the liability account during the year ended December 31, 2014 and for the period from the inception of the royalty transaction on February 24, 2012 (inception) to December 31, 2014 (in thousands):

 

     Year ended
December 31,
2014		      Period from
inception to
December 31,
2014		  

Liability related to sale of future royalties — beginning balance

    $ 128,520      $ —    

Proceeds from sale of future royalties

      —          124,000   

Payments from Nektar to RPI

      (7,000 )       (10,000 ) 

Non-cash CIMZIA® and MIRCERA® royalty revenue

      (21,937 )       (54,783 ) 

Non-cash interest expense recognized

      20,888         61,254   
  

 

 

     

 

 

  

Liability related to sale of future royalties — ending balance

    $ 120,471       $ 120,471