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Stock options - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Apr. 07, 2016
Sep. 04, 2015
Sep. 05, 2014
May 31, 2010
Oct. 31, 2016
Mar. 09, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average remaining life of options outstanding         4 years 6 months 4 days  
Weighted average remaining contractual life of options exercisable         3 years 3 months  
Weighted average life of options vested and expected to vest         4 years 6 months  
Aggregate intrinsic value of options outstanding         $ 99,000  
Aggregate intrinsic value of options exercisable         99,000  
Aggregate intrinsic value of options vested and expected to vest         99,000  
Non-vested stock-based arrangements yet to be recognized         $ 396,000  
Stock based arrangements yet to be recognized, weighted average period expected to be recognized         5 years 4 months 13 days  
Non-employee director annual grant         $ 30,000  
Options granted for each non-employee director         17,064  
Value of stock option issued         $ 15,000  
Fair value of stock option         $ 0.87  
Chief Operating Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, options, grants in period, gross 33,744          
Stock Issued During Period, Value, Share-based Compensation, Gross $ 8,750          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price $ 0.26          
2000 Stock Option Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized       1,320,000    
2010 Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         914,821  
Incentive and Non-Qualified Stock Option Plans            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional Shares Of Common Stock Issued   500,000 500,000      
Additional Shares Of Common Stock Issuance Date         Sep. 05, 2014