Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Accrued Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Accrued Liabilities Current [Abstract]
Accrued professional fees	$ 239	$ 434
Accrued clinical study expense	2,206	2,163
Accrued purchases	647	679
Acquisition of in-process research and development and intangible assets	1,148	989
Due to customers	321	19
Construction-in-progress	272
Operating lease liability, current portion	436
Deferred rent, current portion		130
Other	278	376
Total accrued other liabilities	$ 5,547	$ 4,790