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Liability Related to the Sale of Future Royalties (Tables)
 3 Months Ended
Dec. 31, 2024
Liability Related To The Sale Of Future Royalties [Abstract]  
Schedule of Liability Related to the Sale of Future Royalties
The following table presents the activity with respect to the liability related to the sale of future royalties.
December 31, 2024September 30, 2024
(in thousands)
Beginning carrying value
$341,361 $268,326 
Milestone payment received
— 50,000 
Non-cash interest expense recognized5,415 23,035 
Ending carrying value
$346,776 $341,361