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Related Party Transactions - Summary of Rent and Related Operating Expenses Recognized under Various Agreements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Sep. 30, 2025	Mar. 31, 2025
Related Party Transaction [Line Items]
Research and development	$ 14,379		$ 15,377
General and administrative	5,327		5,041
Lease Agreement
Related Party Transaction [Line Items]
Research and development	72		217
General and administrative	25		74
Total expenses	97		$ 291
Marlinspike Group, LLC | Consulting Agreements
Related Party Transaction [Line Items]
General and administrative	60	$ 60
Total expenses	$ 60	$ 60

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