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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |
U.S. federal statutory tax rate | 21.00% | 21.00% |  | 35.00%
Impact of CARES Act | $ (735,000) | $ 1,700,000 |  |
Excess tax benefits related to stock based compensation expense | 900,000 | 400,000 | $ 500,000 |
Deferred tax asset valuation allowance | 7,253,000 | 6,246,000 |  |
Unrecognized tax benefits that would impact effective tax rate | 2,700,000 | 2,700,000 | 2,100,000 |
Accrued interest and penalties on unrecognized tax benefits | 400,000 | 600,000 | $ 500,000 |
Undistributed earnings in foreign subsidiaries | 0 | $ 0 |  |
Federal [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards | $ 100,000 |  |  |
Net operating loss carryforwards, beginning of expiration year | Jan. 01, 2035 |  |  |
State [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards | $ 100,000 |  |  |
Net operating loss carryforwards, beginning of expiration year | Jan. 01, 2029 |  |  |
Ireland and Luxembourg [Member] | Creagh Medical Ltd [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards | $ 4,100,000 |  |  |
R&D Credit Carryforwards [Member] | Federal and State [Member] | 2029 [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Tax credit carryforwards | $ 3,100,000 |  |  |
Tax credit carryforward, beginning of expiration year | Jan. 01, 2029 |  |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) attributable to enactment of the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”). + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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