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Income Taxes - Additional Information (Details) - USD ($)
 2 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Operating Loss Carryforwards [Line Items]          
Income tax expense (benefit)   $ 109,000 $ (3,015,000) $ 44,000  
U.S. federal corporate tax rate 34.00% 21.00% 23.20% 34.00%  
Reduction of valuation allowance attributable to deferred tax assets   $ 2,000,000      
Deferred federal income tax expense (benefit)         $ 0
Franchise tax expense   200,000 $ 500,000 $ 500,000  
Federal Operating Loss Carryforwards   850,000,000      
State Operating Loss Carryforwards   438,800,000      
Tax Credits, State   8,800,000      
Unrecognized Tax Benefits   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, 2020      
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, 2020      
State [Member] | Maximum [Member]          
Operating Loss Carryforwards [Line Items]          
Tax Credit Carryforward, Expiration Date   Jan. 01, 2039      
IPR&D          
Operating Loss Carryforwards [Line Items]          
Reduction in deferred tax liability   $ 1,000,000