Quarterly report pursuant to Section 13 or 15(d)

Stock Warrants - Additional Information (Detail)

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Stock Warrants - Additional Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Class of Warrant or Right    
Warrants outstanding to purchase common stock 17,500,000  
Warrants, weighted average exercise price 0.56  
Minimum
   
Class of Warrant or Right    
Warrants, exercisable price 0.32  
Maximum
   
Class of Warrant or Right    
Warrants, exercisable price 2.375  
Series V Warrants
   
Class of Warrant or Right    
Warrants exercised 20,000 810,000
Warrants exercised, common stock issued 20,000  
Warrants exercised, gross proceeds $ 6,200