Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants - Additional Information (Detail)

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Stock Options and Warrants - Additional Information (Detail) (2012 Equity Incentive Plan, USD $)
3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense related to stock options and warrants $ 137,500 $ 226,000
Grant date fair value of options 82,500 1,115,000
Grant date fair value of warrants vested 82,500 1,115,000
Unrecognized compensation costs $ 715,000  
Weighted average period over which unrecognized compensation costs is expected to be recognized 1 year 7 months 2 days  
Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for future issuance 3,000,000  
Shares available for future stock-based grants 938,903  
Stock Options | Director
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted, shares 300,000  
Stock options granted, exercise price $ 0.66  
Percentage of option awards vesting 25.00%  
Stock options, vesting period 1 year  
Grant date fair value of options $ 0.33