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Derivative Financial Instruments - Additional Information (Detail) (USD $)
 1 Months Ended
Apr. 30, 2011
Stockholders
May 10, 2012
Nov. 30, 2011
Nov. 08, 2011
Oct. 31, 2010
Derivative Instruments And Hedging Activities Disclosure [Abstract]          
Holders of Series G Preferred Stock 2        
Percentage increase in share price 1.00%        
Issued warrants to acquire common shares 525,000 260,417 1,302,083   1,800,000
Shares accessible based upon election to require   434,027   434,027  
Original principal amount   $ 8,000,000