Quarterly report pursuant to Section 13 or 15(d)

Financial Liabilities Measured at Fair Value on Recurring Basis by Level (Detail)

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Financial Liabilities Measured at Fair Value on Recurring Basis by Level (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to warrants, current $ 793,418 $ 568,930
Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to warrants, current 793,418 568,930
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to warrants, current $ 793,418 $ 568,930