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Liability Related to Sale of Future Royalties (Tables)
 12 Months Ended
Dec. 31, 2021
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 year ended December 31, 2021:

December 31, 2021
(in thousands)
Liability related to sale of future royalties, net — beginning balance$— 
Proceeds from sale of future royalties, net44,783 
MTPC royalties payable(821)
Non-cash interest expense recognized9,117 
Liability related to sale of future royalties, net — ending balance$53,079