Liability Related to Sale of Future Royalties (Tables)

12 Months Ended

Dec. 31, 2021

Deferred Revenue Disclosure [Abstract]

Schedule of Activity Within Liability Related to Sale of Future Royalties

The following table shows the activity within the liability account for the years ended December 31, 2021 and December 2020.

(In thousands)	December 31, 2021			December 31, 2020
Liability related to sale of future royalties - beginning balance	$	15,257		$	24,401
Deferred transaction costs amortized		234			401
Non-cash royalty revenue payable to HCRP		(12,106	)		(11,486	)
Non-cash interest expense recognized		1,075			1,941
Liability related to sale of future royalties - ending balance	$	4,460		$	15,257