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Summary of Significant Accounting Policies and Select Balance Sheet Information - Summary of Prepaids and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid expenses $ 1,712 $ 1,418
Irish research and development credits receivable 1,164 1,177
CARES Act employee retention credit receivable 3,577 3,600
Other   775
Prepaids and other $ 6,453 $ 3,370