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Series B and Series B-2 Preferred Stock (Details)
$ / shares in Units, $ in Thousands
2 Months Ended 12 Months Ended
Apr. 30, 2014
USD ($)
$ / shares
shares
Oct. 31, 2020
vote
$ / shares
shares
Oct. 31, 2019
$ / shares
shares
Oct. 31, 2017
shares
Oct. 31, 2016
shares
Oct. 31, 2015
shares
Oct. 31, 1997
$ / shares
shares
Common Stock              
Temporary Equity [Line Items]              
Shares issued upon conversion (in shares)       177,624 6,250 6,250  
Series B Convertible Preferred Stock              
Temporary Equity [Line Items]              
Shares of convertible preferred stock issued (in shares)             30,000
Par value of convertible preferred stock (in dollars per share) | $ / shares             $ 100.00
Cumulative cash dividend percentage   8.75% 8.75%        
Number of votes | vote   10          
Preferred stock, shares outstanding (in shares)   14,790          
Conversion price (in dollars per share) | $ / shares   $ 8.00          
Shares converted (in shares)       14,210 500 500  
Series B-2 Convertible Preferred Stock              
Temporary Equity [Line Items]              
Shares of convertible preferred stock issued (in shares) 9,300            
Par value of convertible preferred stock (in dollars per share) | $ / shares $ 100.00            
Cumulative cash dividend percentage 4.00% 4.00% 4.00%        
Number of votes | vote   1          
Preferred stock, shares outstanding (in shares)   9,300 9,300        
Conversion price (in dollars per share) | $ / shares   $ 15.00          
Issuance of preferred stock | $ $ 9,300            
Conversion term   30 days          
Liquidation preference per share (in dollars per share) | $ / shares   $ 1,000 $ 1,000