Annual report pursuant to Section 13 and 15(d)

Intangible Assets Activity (Detail)

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Intangible Assets Activity (Detail) - USD ($)
May. 31, 2015
May. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amounts $ 3,500,000 $ 3,500,000
Accumulated amortization (918,750) (568,750)
Total amortizable intangible assets, net 2,581,250 2,931,250
Patents currently not amortized 35,989 35,989
Carrying value of intangibles, net $ 2,617,239 $ 2,967,239