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Summary of Significant Accounting Policies and Select Balance Sheet Information - Additional Information (Detail) - USD ($) shares in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Oct. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Held-to-maturity debt securities | $ 0 | $ 0 |  |
Realized gains or losses on sales of available-for-sale securities | 0 | 0 | $ 0 |
CARES Act employee retention credit, benefit to operating costs and expenses | 3,600,000 |  |  |
CARES Act employee retention credit receivable | 3,577,000 | 3,600,000 |  |
Depreciation expense | 4,900,000 | 4,800,000 | 4,700,000 |
Amortization expense | 3,100,000 | 2,500,000 | 2,600,000 |
Impairment loss | 0 | 0 |  |
Goodwill impairment charges | 0 | 0 | 0 |
Impairment charges relating to long-lived assets | $ 0 | $ 0 | $ 0 |
Antidilutive options excluded from computation of EPS | 0.1 | 0.1 | 0.2 |
ASC Topic 842 adoption, right-of-use asset | $ 2,435,000 | $ 2,508,000 |  |
ASC Topic 842 adoption, lease liability | 3,706,000 | 3,776,000 |  |
Deferred rent liability |  | 1,200,000 |  |
ASC Topic 842 [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
ASC Topic 842 adoption, right-of-use asset |  |  |  | $ 1,700,000
ASC Topic 842 adoption, lease liability |  |  |  | $ 2,900,000
Abbott Agreement [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Collaborative arrangement payment received | 60,800,000 |  |  |
Collaborative arrangement additional potential milestone payments receivable | $ 30,000,000 |  |  |
Abbott Agreement [Member] | TRANSCEND Clinical Trial [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Clinical study completion period | 4 years |  |  |
IDA [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Reimbursement recorded as reduction to R&D expense |  | 800,000 | $ 700,000 |
Revenue [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Performance obligations, payment terms, royalties | 45 days |  |  |
Minimum [Member] | Revenue [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Performance obligations, payment terms, product sales | 30 days |  |  |
Performance obligations, payment terms, R&D services | 30 days |  |  |
Maximum [Member] | Revenue [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Performance obligations, payment terms, product sales | 45 days |  |  |
Performance obligations, payment terms, R&D services | 45 days |  |  |
Leases [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease description | The Company leases facilities for research, office, manufacturing and warehousing. |  |  |
Lease, existence of option to extend | true |  |  |
Lease, option to extend | The Company’s leases include one or more options to renew and extend the lease term at the Company’s discretion. These renewal options are not included in right-of-use assets and lease liabilities as they are not reasonably certain of exercise. |  |  |
Operating lease cost | $ 800,000 | $ 600,000 |  |
Rent expense related to operating leases |  |  | 500,000 |
Weighted average remaining lease term for operating leases | 6 years 2 months 12 days |  |  |
Weighted average discount rate used to determine operating lease liabilities | 4.00% |  |  |
Research and development expense [Member] | In-Process Research and Development [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Impairment loss |  |  | $ 300,000 |

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