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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
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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

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- Definition Receivable for anticipated reimbursement of personnel expenses associated with the employee retention credit under the provisions of the Coronavirus Aid, Relief and Economic Security Act (the "CARES Act") enacted in March 2020. + References No definition available. + Details
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