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 $)
0 Months Ended 1 Months Ended 12 Months Ended
May 31, 2014
Oct. 31, 2012
May 31, 2014
May 31, 2013
Business Acquisition [Line Items]        
Asset purchase, cash paid   $ 3,500,000    
Intangible asset acquired 3,500,000     3,500,000
Estimated life     10 years  
Amortization expense related to intangible patents     350,000 219,000
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