Stockholders' Equity - Summary of Common Stock Reserved for Future Issuance (Detail) - shares	Sep. 30, 2023	Sep. 30, 2022
Class Of Stock [Line Items]
Common stock warrants	4,876,571	4,876,639
Common stock available for issuance under stock plans	708,768	94,524
Total	5,804,258	5,100,169
Common Stock [Member]
Class Of Stock [Line Items]
Common stock warrants	68
Common stock options issued and outstanding under stock plans	218,919	129,006