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Segment Information and Concentrations - Major customers as a percentage of net accounts receivable balances (Details)
Sep. 30, 2013
Dec. 31, 2012
Company A
   
Percent of net accounts receivable balances 34.00% 28.00%
Threshold percentage for disclosure 10.00% 10.00%
Company B
   
Percent of net accounts receivable balances 26.00% 12.00%
Threshold percentage for disclosure 10.00% 10.00%
Company C
   
Percent of net accounts receivable balances 10.00% 16.00%
Threshold percentage for disclosure 10.00% 10.00%
Company D
   
Percent of net accounts receivable balances    11.00%
Threshold percentage for disclosure 10.00% 10.00%
Company E
   
Percent of net accounts receivable balances    12.00%
Threshold percentage for disclosure 10.00% 10.00%