Liability Related to the Sale of Future Royalties (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Liability Related to Potential Future Royalties

The following table shows the activity within the liability account during the year ended December 31, 2018 and for the period from the inception of the royalty transaction on February 24, 2012 (inception) to December 31, 2018 (in thousands):

	Year ended December 31, 2018			Period from inception to December 31, 2018
Liability related to the sale of future royalties—beginning balance	$	96,922		$	—
Proceeds from sale of future royalties		—			124,000
Payments from Nektar to RPI		—			(10,000	)
Non-cash CIMZIA^® and MIRCERA^® royalty revenue		(33,308	)		(170,839	)
Non-cash interest expense recognized		21,196			141,649
Liability related to the sale of future royalties – ending balance		84,810			84,810
Less: unamortized transaction costs		(1,899	)		(1,899	)
Liability related to the sale of future royalties, net	$	82,911		$	82,911