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Liability Related to Sale of Future Royalties (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013 and for the period from the inception of the royalty transaction on February 24, 2012 (inception) to December 31, 2013 (in thousands):

 

     Year ended
December 31,
2013		     Period from
inception to
December 31,
2013		  

Liability related to sale of future royalties—beginning balance

    $ 131,266     $ —     

Proceeds from sale of future royalties

      —         124,000   

Non-cash interest expense recognized

      22,309        40,366   

Non-cash CIMZIA® and MIRCERA® royalty revenue

      (22,055 )      (32,846 ) 

Payments from Nektar to RPI

      (3,000 )      (3,000 ) 
  

 

 

    

 

 

  

Total liability related to sale of future royalties as of December 31, 2013

      128,520        128,520   

Less: current portion

      (7,000 )      (7,000 ) 
  

 

 

    

 

 

  

Liability related to sale of future royalties, less current portion

    $ 121,520      $ 121,520