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Summary of Significant Accounting Policies and Supplemental Balance Sheet Information - Amortized Cost, Unrealized Holding Gains and (Losses) and Fair Value of Available-for-sale Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 3,997 $ 3,936
Unrealized Losses   (3)
Fair Value 3,997 3,933
Commercial paper and corporate bonds [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 3,997 3,936
Unrealized Losses   (3)
Fair Value $ 3,997 $ 3,933