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Net Income (Loss) Per Common Share - Additional Information (Detail)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Stock Options
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities2,078,1252,530,1372,100,7662,537,563
Warrants
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities20,932,836 20,932,836 
Restricted Stock Member
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities283,643