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Liability Related to the Sale of Future Royalties - Summary of the Liability Related to the Sale of Future Royalties (Parenthetical) (Detail) $ in Thousands	9 Months Ended
	Jun. 30, 2025 USD ($)
OMERS Royalty Purchase Agreement [Member] | Sale Of Future Royalties [Member]
Nonmonetary Transaction [Line Items]
Interest expense, net of capitalized interest	$ 519

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