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Liability Related to the Sale of Future Royalties (Tables)
 12 Months Ended
Dec. 31, 2019
Liability Related To Sale Of Potential Future Royalties [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, 2019 and for the period from the inception of the royalty transaction on February 24, 2012 (inception) to December 31, 2019 (in thousands):
 
Year ended
December 31,
2019
 
Period from
inception to
December 31,
2019
Liability related to the sale of future royalties—beginning balance
$
84,810

 
$
—

Proceeds from sale of future royalties
—

 
124,000

Payments from Nektar to RPI
—

 
(10,000
)
Non-cash CIMZIA® and MIRCERA® royalty revenue
(36,303
)
 
(207,142
)
Non-cash interest expense recognized
25,044

 
166,693

Liability related to the sale of future royalties – ending balance
73,551

 
73,551

Less: unamortized transaction costs
(1,531
)
 
(1,531
)
Liability related to the sale of future royalties, net
$
72,020

 
$
72,020