Annual report pursuant to Section 13 and 15(d)

Acquisition of Patents - Additional Information (Detail)

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Acquisition of Patents - Additional Information (Detail) - USD ($)
12 Months Ended
Oct. 16, 2012
May. 31, 2015
May. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]      
Asset purchase, cash paid $ 3,500,000    
Intangible asset acquired   $ 3,500,000 $ 3,500,000
Estimated aggregate future amortization expense in year one   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    
Remaining approximate life   8 years  
Amortization expense related to patents   $ 350,000 $ 350,000