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Liability Related to the Sale of Future Royalties (Tables)
 6 Months Ended
Mar. 31, 2025
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.
March 31, 2025September 30, 2024
(in thousands)
Beginning carrying value
$341,361 $268,326 
Milestone payment received
— 50,000 
Non-cash interest expense recognized10,915 23,035 
Ending carrying value
$352,276 $341,361