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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |
Statutory tax rate based on blended rate calculation | 35.00% | 21.00% | 21.00% | 24.30%
(Reductions) additions to valuation allowance |  | $ (2,167,000) | $ 131,000 |
Operating loss carryforwards, annual utilization limits |  | $ 800,000 |  |
Operating loss carryforwards, utilization limit, percent |  | 80.00% |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 500,000 |  |
Net expense (benefit) for interest and penalties |  | 4,000 | 100,000 | $ (2,000,000.0)
Cumulative accrual for potential interest and penalties |  | $ 800,000 | 800,000 |
Maximum |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Number of years open for tax examinations |  | 5 years |  |
Minimum |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Number of years open for tax examinations |  | 3 years |  |
Federal |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards |  | $ 13,800,000 |  |
Net operating loss carryforwards with indefinite carryforward period |  |  | 74,100,000 |
Foreign Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards |  | 0 |  |
State Jurisdiction |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards |  | 21,600,000 |  |
SoLayTec |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  | $ (1,300,000) |
Tempress |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense (benefit) from discontinued operations |  | (11,100,000) |  |
R2D |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense (benefit) from discontinued operations |  | $ 200,000 |  |

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