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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2012
Summary Of Significant Accounting Policies [Abstract]  
Summary of estimated useful life of property and equipment
 
 Property and plant 
 15-20 Years
 
 Leasehold improvements
 2-10 Years
 
 Machinery and equipment
 10 Years
 
 Office equipment and furniture
 3-5 Years
 
 Motor vehicles
 5 Years