Quarterly report pursuant to sections 13 or 15(d)

Private Equity Offering - Additional Information (Detail)

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Private Equity Offering - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2014
May 31, 2013
Oct. 23, 2013
Private Equity Offering
Feb. 28, 2014
Private Equity Offering
Feb. 28, 2014
Private Equity Offering
Equity and Equity Units Offering Disclosure [Line Items]          
Units authorized to be sold at private equity offering     11,153,850    
Price per unit     $ 1.30    
Proceeds from units sold at private equity offering     $ 14,500,000   $ 14,500,000
Number of shares issued     2 20,989,494 2
Warrant to purchase common share     1 1 1
Exercisable warrants, exercise price     0.75 0.75 0.75
Convertible note, conversion amount $ 2,450,000 $ 567,000   $ 857,000  
Convertible note, shares of common stock issued       1,318,206  
Number of common stock warrants issued       11,153,850 11,153,850