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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 9 Months Ended | 10 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017 | Oct. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  | $ 15 | $ (1) | $ (3,020) | $ 44 |
U.S. federal corporate tax rate | 34.00% |  |  |  |  |
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 |  |
Scenario Plan [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
U.S. federal corporate tax rate |  |  |  |  |  | 21.00%

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