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Segment Information and Concentrations of Risk (Details Textual)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Customer One [Member]
      
Segment Information and Concentrations of Risk (Textual) [Abstract]      
Net Revenue, Percentage 57.50% 50.80% 55.70%
Total accounts receivable 20.70% 46.50%  
Customer Two [Member]
      
Segment Information and Concentrations of Risk (Textual) [Abstract]      
Net Revenue, Percentage   13.10% 21.80%
Total accounts receivable 18.50% 19.80%  
Customer Three [Member]
      
Segment Information and Concentrations of Risk (Textual) [Abstract]      
Total accounts receivable 11.50%