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Income Taxes - Additional Information (Details) - USD ($) | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax expense (benefit) |  |  | $ (3,015,000) | $ 44,000 | $ 519,000
U.S. federal corporate tax rate | 34.00% | 21.00% | 23.20% | 34.00% | 34.00%
Reduction of valuation allowance attributable to deferred tax assets |  |  | $ 2,000,000 |  |
Deferred federal income tax expense (benefit) |  |  |  | $ 0 | $ 0
Franchise tax expense |  |  | 500,000 | 500,000 | $ 400,000
Federal Operating Loss Carryforwards |  | $ 799,900,000 | 799,900,000 |  |
State Operating Loss Carryforwards |  | 410,200,000 | 410,200,000 |  |
Tax Credits, State |  | 8,300,000 | 8,300,000 |  |
Unrecognized Tax Benefits |  | $ 15,700,000 | 15,700,000 | 15,700,000 |
Unrecognized tax benefits, provision for interest or penalties |  |  | $ 0 | $ 0 |
Federal [Member] | Minimum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax Credit Carryforward, Expiration Date |  |  | Jan. 01, 2019 |  |
Federal [Member] | Maximum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax Credit Carryforward, Expiration Date |  |  | Jan. 01, 2037 |  |
State [Member] | Minimum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Jan. 01, 2019 | Jan. 01, 2019 |  |
State [Member] | Maximum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Jan. 01, 2037 | Jan. 01, 2037 |  |
IPR&D |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Reduction in deferred tax liability |  |  | $ 1,000,000 |  |

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