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Liability Related to Sale of Future Royalties (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 2021:
September 30, 2021
(in thousands)
Liability related to sale of future royalties, net — beginning balance$— 
Proceeds from sale of future royalties, net44,783
MTPC royalties payable(425)
Non-cash interest expense recognized6,779
Liability related to sale of future royalties, net — ending balance$51,137