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Liability Related to Sale of Future Royalties (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2022:

March 31, 2022
(in thousands)
Liability related to sale of future royalties, net beginning balance at December 31, 2021$53,079 
MTPC royalties payable(329)
Non-cash interest expense recognized2,345
Liability related to sale of future royalties, net — ending balance$55,095