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Stock Warrants - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Class of Warrant or Right [Line Items]  
Weighted average term of warrants 1 year 8 months 12 days
Weighted average exercise price of warrants per share $ 0.1445
Minimum
 
Class of Warrant or Right [Line Items]  
Outstanding Warrants Expiration Date Dec. 31, 2012
Maximum
 
Class of Warrant or Right [Line Items]  
Outstanding Warrants Expiration Date May 21, 2015