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Fair Value of Financial Assets and Liabilities - Financial Assets and Liabilities that were Subject to Fair Value Measurement on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Assets:    
Marketable securities $ 159,299 $ 210,953
Assets, Fair Value Disclosure, Total 187,418 244,401
Liabilities:    
Liabilities, Fair Value Disclosure, Total 1,350 1,350
Series 1 Nonconvertible Preferred Stock [Member]    
Liabilities:    
Liabilities 1,350 1,350
Level 1 [Member]    
Assets:    
Assets, Fair Value Disclosure, Total 187,418 244,401
Liabilities:    
Liabilities, Fair Value Disclosure, Total 0 0
Level 1 [Member] | Series 1 Nonconvertible Preferred Stock [Member]    
Liabilities:    
Liabilities 0 0
Level 2 [Member]    
Assets:    
Assets, Fair Value Disclosure, Total 0 0
Liabilities:    
Liabilities, Fair Value Disclosure, Total 0 0
Level 2 [Member] | Series 1 Nonconvertible Preferred Stock [Member]    
Liabilities:    
Liabilities 0 0
Level 3 [Member]    
Assets:    
Assets, Fair Value Disclosure, Total 0 0
Liabilities:    
Liabilities, Fair Value Disclosure, Total 1,350 1,350
Level 3 [Member] | Series 1 Nonconvertible Preferred Stock [Member]    
Liabilities:    
Liabilities 1,350 1,350
Money Market Funds [Member]    
Assets:    
Cash equivalents 28,119 33,448
Money Market Funds [Member] | Level 1 [Member]    
Assets:    
Cash equivalents 28,119 33,448
Money Market Funds [Member] | Level 2 [Member]    
Assets:    
Cash equivalents 0 0
Money Market Funds [Member] | Level 3 [Member]    
Assets:    
Cash equivalents 0 0
U.S. Treasury Notes [Member]    
Assets:    
Marketable securities 159,299 210,953
U.S. Treasury Notes [Member] | Level 1 [Member]    
Assets:    
Marketable securities 159,299 210,953
U.S. Treasury Notes [Member] | Level 2 [Member]    
Assets:    
Marketable securities 0 0
U.S. Treasury Notes [Member] | Level 3 [Member]    
Assets:    
Marketable securities $ 0 $ 0