Interest Expense

12 Months Ended

Dec. 31, 2023

Other Income and Expenses [Abstract]

Interest Expense

Interest Expense

Interest expense consists of the following (dollars in thousands):

	Years Ended December 31,
	2023		2022		2021
Interest expense	$	(1,321)	$	(2,542)	$	(2,195)
Noncash interest expense on nonrecourse liability related to sale of future royalties	(562)		(2,416)		(3,727)
Noncash interest expense on debt	(532)		(2,112)		(17,501)
Total	$	(2,415)	$	(7,070)	$	(23,423)

Noncash interest expense on debt is related to amortization of deferred financing costs on the 2023 Notes. The Company fully amortized the deferred financing costs on the 2023 Notes in the first quarter of 2023. (see Note 8, Debt).