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Series B and Series B-2 Preferred Stock (Details)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended 36 Months Ended
Apr. 30, 2014
USD ($)
$ / shares
shares
Oct. 31, 2021
vote
$ / shares
shares
Oct. 31, 2020
$ / shares
shares
Oct. 31, 2017
shares
Oct. 31, 1997
$ / shares
shares
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 14,790    
Conversion price (in dollars per share) | $ / shares   $ 8.00      
Temporary equity, shares converted (in shares)       15,210  
Common Stock          
Temporary Equity [Line Items]          
Convertible preferred stock, shares issued upon conversion (in shares)       190,124  
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 | $ $ 9.3        
Conversion term   30 days      
Liquidation preference per share (in dollars per share) | $ / shares   $ 1,000 $ 1,000