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Stock-based compensation and equity transactions - Additional Information (Detail) - USD ($)
3 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining life of options outstanding 4 years 4 months 10 days      
Weighted average remaining contractual life of options exercisable 3 years 5 months 16 days      
Weighted average life of options vested and expected to vest 4 years 4 months 6 days      
Aggregate intrinsic value of options outstanding $ 107,000      
Aggregate intrinsic value of options exercisable 84,000      
Aggregate intrinsic value of options vested and expected to vest 107,000      
Non-vested stock-based arrangements yet to be recognized $ 359,000      
Stock based arrangements yet to be recognized, weighted average period expected to be recognized 2 years 8 months 19 days      
Non-employee director annual grant     $ 50,000 $ 30,000
Options granted for each non-employee director 77,339      
Value of stock option issued $ 25,000      
Fair value of stock option     $ 0.32  
Stock based compensation expense 51,000 $ 52,000    
Cost of Sales        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense 3,000 10,000    
Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense $ 48,000 $ 42,000