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Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Accrued Other Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Accrued Liabilities Current [Abstract] |  |
Accrued professional fees | $ 489 | $ 239
Accrued clinical study expense | 1,667 | 2,206
Accrued purchases | 1,195 | 647
Acquisition of in-process research and development and intangible assets | 494 | 1,148
Due to customers | 112 | 321
Construction-in-progress | 23 | 272
Operating lease liability, current portion | 518 | 436
Other | 407 | 278
Total accrued other liabilities | $ 4,905 | $ 5,547

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