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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
May 31, 2014
May 31, 2013
Schedule Of Income Taxes [Line Items]    
Federal and state income tax benefit $ 0 $ 0
Statutory federal income tax rate 34.00% 34.00%
Federal net operating loss and tax credit carryforwards 30,488,000 26,616,000
State net operating loss carryforwards 7,860,000 7,380,000
State net operating loss carryforwards life expectancy, minimum 5 years  
State net operating loss carryforwards life expectancy, maximum 20 years  
Interest or penalties related to income tax 0 0
Unrecognized tax benefits $ 0 $ 0
Minimum [Member]
   
Schedule Of Income Taxes [Line Items]    
Federal net operating loss and tax credit carryforwards life expectancy 16 years  
Maximum [Member]
   
Schedule Of Income Taxes [Line Items]    
Federal net operating loss and tax credit carryforwards life expectancy 20 years