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Summary of Significant Accounting Policies and Supplemental Balance Sheet Information - Summary of Prepaids and Other Current Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Prepaid expenses | $ 2,600 | $ 2,570
Irish research and development credits receivable | 1,322 | 753
CARES Act employee retention credit receivable | 3,441 | 3,441
Prepaids and other | $ 7,363 | $ 6,764

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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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