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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ 20 | $ 15 | $ 89 | $ (3,020)
U.S. federal corporate tax rate | 34.00% |  |  | 21.00% |
Reduction of valuation allowance attributable to deferred tax assets |  |  |  | $ 2,000 |
IPR&D |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Reduction in deferred tax liability |  |  |  | $ 1,000 |

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