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Liability Related to Sale of Future Royalties (Tables)
 9 Months Ended
Sep. 30, 2022
Other Liabilities Disclosure [Abstract]  
Activity within Liability Related to Sale of Future Royalties, net
The following table shows the activity within the liability account for the nine months ended September 30, 2022:

September 30, 2022
(in thousands)
Liability related to sale of future royalties, net beginning balance at December 31, 2021$53,079 
MTPC royalties payable(1,195)
Non-cash interest expense recognized6,352
Liability related to sale of future royalties, net — ending balance$58,236