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Nature of the Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Entity incorporated, in year							1995
Net loss	$ 18,255	$ 22,644	$ 22,290	$ 22,658	$ 31,157	$ 33,407	$ 63,189	$ 87,222	$ 116,045
Accumulated deficit	386,229						386,229		$ 323,040
Cash, cash equivalents and short-term marketable securities	$ 204,111						$ 204,111

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