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Summary of Significant Accounting Policies (Detail) - Schedule of Unrecognized Tax Benefits Roll Forward (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Balance $ 2,189,194 $ 1,346,203 $ 3,818,073
Increase in unrecorded tax benefits taken in current year 1,373,704 771,976  
Exchange rate adjustment 146,231 71,015  
Balance $ 3,709,129 $ 2,189,194 $ 3,818,073