Accrued Expenses and Other Long-Term Liabilities - Accrued Expenses and Other Current Liabilities as well as Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Accrued expenses:
Accrued pharmaceutical drug manufacturing	$ 7,614	$ 8,402
Accrued research and development expenses	4,169	6,062
Accrued payroll and related expenses	4,849	6,094
Accrued professional fees	1,443	700
Accrued other	1,116	1,171
Accrued expenses	19,191	22,429
Other long-term liabilities:
Uncertain tax positions	87	558
Asset retirement obligation	354	0
Other long-term liabilities	$ 441	$ 558