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 $)
1 Months Ended 12 Months Ended 115 Months Ended
May 31, 2013
Oct. 31, 2012
May 31, 2013
May 31, 2013
Business Acquisition [Line Items]        
Asset purchase, cash paid   $ 3,500,000    
Intangible asset acquired 3,500,000   3,500,000 3,500,000
Estimated life     10 years  
Amortization expense related to intangible patents     219,000  
Estimated aggregate future amortization expense in year one 350,000   350,000 350,000
Estimated aggregate future amortization expense in year two 350,000   350,000 350,000
Estimated aggregate future amortization expense in year three 350,000   350,000 350,000
Estimated aggregate future amortization expense in year four 350,000   350,000 350,000
Estimated aggregate future amortization expense in year five $ 350,000   $ 350,000 $ 350,000