Interest Expense

6 Months Ended

Jun. 30, 2021

Other Income and Expenses [Abstract]

Interest Expense

Interest Expense

The following details the composition of interest expense (dollars in thousands):

	Three Months ended June 30,				Six Months ended June 30,
	2021		2020		2021		2020
	(unaudited)				(unaudited)
Interest expense	$	(4,498)	$	(4,792)	$	(9,560)	$	(9,485)
Interest expense on nonrecourse liability related to sale of future royalties	(969)		(1,023)		(2,004)		(2,085)
Total	$	(5,467)	$	(5,815)	$	(11,564)	$	(11,570)

Interest expense includes noncash interest expense related to amortization of deferred financing costs, and amortization of the debt discount on the 2023 Notes of $4.3 million and $8.6 million for the three and six months ended June 30, 2021, respectively, and $4.2 million and $8.2 million for the three and six months ended June 30, 2020, respectively.