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Segment Information and Concentrations - Schedule of major customers as a percentage of net accounts receivable (Details)
Jun. 30, 2012
Dec. 31, 2011
Company A
    
Percent of net accounts receivable 33.00% 11.00%
Threshold percentage for disclosure 10.00% 10.00%
Company B
    
Percent of net accounts receivable 20.00%   
Threshold percentage for disclosure 10.00% 10.00%
Company C
    
Percent of net accounts receivable 13.00% 10.00%
Threshold percentage for disclosure 10.00% 10.00%
Company D
    
Percent of net accounts receivable    33.00%
Threshold percentage for disclosure 10.00% 10.00%