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Stockholders' Equity - Common Stock Warrants (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Oct. 13, 2006
Class of Warrant or Right [Line Items]      
Common stock warrants 100,000,000 70,258,276  
Exercise price per share     $ 25.92
July 18, 2018 [Member]
      
Class of Warrant or Right [Line Items]      
Common stock warrants 298,404    
Exercise price per share $ 0.33    
Expiration date Jul. 18, 2018    
January 16, 2019 [Member]
      
Class of Warrant or Right [Line Items]      
Common stock warrants 301,987    
Exercise price per share $ 0.33    
Expiration date Jan. 16, 2019    
December 9, 2015 [Member]
      
Class of Warrant or Right [Line Items]      
Common stock warrants 17,042    
Exercise price per share $ 0.33    
Expiration date Dec. 09, 2015    
January 30, 2019 [Member]
      
Class of Warrant or Right [Line Items]      
Common stock warrants 15,250    
Exercise price per share $ 0.33    
Expiration date Jan. 30, 2019    
December 16, 2015 [Member]
      
Class of Warrant or Right [Line Items]      
Common stock warrants 1,026    
Exercise price per share $ 0.33    
Expiration date Dec. 16, 2015    
October 13, 2016 [Member]
      
Class of Warrant or Right [Line Items]      
Common stock warrants 1,544    
Exercise price per share $ 25.92    
Expiration date Oct. 13, 2016