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Summary of Preferred Stock (Parenthetical) (Detail)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Series B Convertible Preferred Stock
    
Class of Stock [Line Items]    
Convertible preferred stock, cumulative dividend rate 10.00% 10.00%
Series C Convertible Preferred Stock
    
Class of Stock [Line Items]    
Convertible preferred stock, cumulative dividend rate 10.00% 10.00%
Series D Convertible Preferred Stock
    
Class of Stock [Line Items]    
Convertible preferred stock, cumulative dividend rate 10.00% 10.00%
Series E Convertible Preferred Stock
    
Class of Stock [Line Items]    
Convertible preferred stock, cumulative dividend rate 10.00% 10.00%