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Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Deferred income taxes |  |  | $ 6,176,000 | $ 6,304,000 |  |
Income tax receivable |  |  | $ 558,000 | $ 1,152,000 |  |
U.S. federal statutory tax rate | 21.00% | 35.00% | 21.00% | 24.50% | 35.00% |
Discrete tax expense |  | $ 1,200,000 |  | $ 1,600,000 |  |
Excess tax benefits (shortfalls) related to stock based compensation expense |  |  | $ 500,000 | 2,000,000 | $ (200,000) |
Deferred tax asset valuation allowance |  |  | $ 5,328,000 | 4,541,000 |  |
Net operating loss carryforwards, remaining period |  |  | 9 years |  |  |
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate |  |  | $ 2,100,000 | 1,400,000 | 1,200,000 |
Liability for unrecognized tax benefits to change significantly in the next 12 months |  |  | 500,000 | 400,000 | $ 500,000 |
Undistributed earnings in foreign subsidiaries |  |  | 0 | $ 0 |  |
Federal and State [Member] | 2034 [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  |  | $ 200,000 |  |  |
Net operating loss carryforwards, beginning of expiration year |  |  | 2034 |  |  |
Federal and State [Member] | 2022 [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  |  | $ 200,000 |  |  |
Net operating loss carryforwards, beginning of expiration year |  |  | 2022 |  |  |
Ireland and Luxembourg [Member] | Creagh Medical Ltd [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  |  | $ 3,000,000 |  |  |
R&D Credit Carryforwards [Member] | Federal and State [Member] | 2029 [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Tax credit carryforwards |  |  | $ 2,400,000 |  |  |
Tax credit carryforward, beginning of expiration year |  |  | 2029 |  |  |
Adoption of ASC Topic 606 [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  | $ 5,089,000
Income tax receivable |  |  |  |  |  | 762,000
Impact of Adoption [Member] | Adoption of ASC Topic 606 [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Deferred income taxes |  |  | $ 1,200,000 |  |  | (1,215,000)
Income tax receivable |  |  | $ 400,000 |  |  | $ (390,000)

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