General form of registration statement for all companies including face-amount certificate companies

Stockholders' Equity (Detail) - Common Stock Warrants Issued, Expired and Outstanding

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Stockholders' Equity (Detail) - Common Stock Warrants Issued, Expired and Outstanding (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Oct. 31, 2011
Sep. 30, 2011
Dec. 31, 2006
Dec. 31, 2011
Warrant [Member]
Dec. 31, 2010
Warrant [Member]
Dec. 31, 2009
Warrant [Member]
Dec. 31, 2008
Warrant [Member]
Warrants outstanding shares   8,945,247 1,922,944       1,922,944 435,986 410,542 828,502
Warrants outstanding weighted-average exercise price (in Dollars per Item) (in Dollars per Item) 1.10 0.94 0.43 0.75 0.01 4.00 0.43 3.74 0.42 1.74
Warrants issued shares 2,727,274 7,607,071         2,122,500 25,444    
Warrants issued weighted-average exercise price (in Dollars per share) (in Dollars per share) $ 1.45 $ 1.05         $ 0.29 $ 8.00    
Warrants exercised during 2011   584,768         (225,000)      
Warrants exercised during 2011 (in Dollars per share)   $ 0.69         $ 0.01      
Warrants that expired shares             (410,542)   (417,960)  
Warrants that expired weighted-average exercise price (in Dollars per share)             $ 3.48   $ 0.04