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Interest Expense
 12 Months Ended
Dec. 31, 2022
Other Income and Expenses [Abstract]  
Interest Expense Interest Expense
Interest expense consists of the following (dollars in thousands):
Years Ended December 31,
202220212020
Interest expense$4,654 $19,696 $19,435 
Interest expense on nonrecourse liability related to sale of future royalties2,416 3,727 4,319 
Total$7,070 $23,423 $23,754 
Interest expense includes noncash interest expense related to amortization of deferred financing costs and amortization of the debt discount on the 2023 Notes, in the amount of $2.1 million, $17.5 million, and $16.6 million for the years ended December 31, 2022, 2021 and 2020, respectively (see Note 2, Summary of Significant Accounting Policies - Accounting Pronouncements Adopted in 2022 and Note 9, Convertible Senior Notes Due 2023).