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Capital Lease Obligations - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Capital Leased Assets [Line Items]        
Interest expenses from capital lease obligations $ 54,024 $ 65,740 $ 108,044 $ 107,956