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Intangible Assets (Details Textual) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Intangible Assets (Textual)          
Intangible asset useful life     2 years    
Weighted average useful life     2 years    
Amortization expenses    $ 68,068    $ 136,136 $ 273,021