Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Accrued Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Accrued Liabilities Current [Abstract]
Accrued professional fees	$ 279	$ 489
Accrued clinical study expense	1,425	1,667
Accrued purchases	1,655	1,195
Acquisition of in-process research and development	981	494
Operating lease liability, current portion	$ 963	$ 518
Operating Lease Liability Current Statement Of Financial Position Extensible List	Total accrued other liabilities	Total accrued other liabilities
Other	$ 551	$ 542
Total accrued other liabilities	$ 5,854	$ 4,905