Quarterly report pursuant to Section 13 or 15(d)

Acquisition of patents - Additional Information (Detail)

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Acquisition of patents - Additional Information (Detail) - USD ($)
3 Months Ended
Oct. 16, 2012
Aug. 31, 2017
Aug. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]      
Asset purchase, cash paid $ 3,500,000    
Intangible asset acquired gross   $ 3,500,000  
Estimated aggregate future amortization expense in next twelve months   350,000  
Estimated aggregate future amortization expense in year two   350,000  
Estimated aggregate future amortization expense in year three   350,000  
Estimated aggregate future amortization expense in year four   350,000  
Estimated aggregate future amortization expense in year five   350,000  
Patents      
Acquired Finite-Lived Intangible Assets [Line Items]      
Asset purchase, cash paid $ 3,500,000    
Estimated useful life of acquired asset 10 years    
Amortization expense related to patents   $ 87,500 $ 87,500