Sale of Future Royalties (Tables)

3 Months Ended

Mar. 31, 2020

Other Liabilities Disclosure [Abstract]

Schedule of activity related to the net liability from inception of the Agreement

The table below shows the activity related to the net liability for 2020:

	Three Months Ended March 31, 2020
	(in thousands)
Net liability related to sale of future royalties - beginning balance	$	18,992
Non-cash royalty revenue	(656		)
Non-cash interest expense	1,039
Net liability related to sale of future royalties - ending balance	$	19,375