Annual report pursuant to Section 13 and 15(d)

Private Equity Offering - Additional Information (Detail)

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Private Equity Offering - Additional Information (Detail) (Private Equity Offering, USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended
Oct. 23, 2013
May 31, 2014
Oct. 23, 2013
Private Equity Offering
     
Equity and Equity Units Offering Disclosure [Line Items]      
Units sold at private equity offering 11,153,850    
Price per unit     $ 1.30
Proceeds from units sold at private equity offering $ 14.5 $ 14.5  
Number of common stock per unit   2 2
Number of shares issued   20,989,494  
Warrant to purchase common share   1 1
Exercisable warrants, exercise price   0.75 0.75
Number of common stock warrants issued   11,153,850