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Other Current Liabilities (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Other Liabilities Current [Line Items]    
Accrued expenses $ 2,901,847 $ 1,316,086
Accrued professional service fees 1,032,931 352,892
Conference fee payable 169,339 77,457
Other payables 1,058,728 1,784,789
Deferred revenues 5,320,260 981,340
Other tax payable 1,468,789 550,386
Other liabilities, current $ 11,951,894 $ 5,062,950