Liability Related to the Sale of Future Royalties (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Liability Related to Potential Future Royalties

The following table shows the activity within the liability account during the year ended December 31, 2017 and for the period from the inception of the royalty transaction on February 24, 2012 (inception) to December 31, 2017 (in thousands):

	Year ended December 31, 2017			Period from inception to December 31, 2017
Liability related to the sale of future royalties—beginning balance	$	108,584		$	—
Proceeds from sale of future royalties		—			124,000
Payments from Nektar to RPI		—			(10,000	)
Non-cash CIMZIA^® and MIRCERA^® royalty revenue		(30,531	)		(137,531	)
Non-cash interest expense recognized		18,869			120,453
Liability related to the sale of future royalties – ending balance		96,922			96,922
Less: unamortized transaction costs		(2,267	)		(2,267	)
Liability related to the sale of future royalties, net	$	94,655		$	94,655