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Assets Measured and Recorded at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - money market accounts $ 20,263,766 $ 20,263,766
Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - money market accounts $ 20,263,766 $ 20,263,766