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Segment Information and Concentrations - Major customers as a percentage of net accounts receivable balances (Details)
Jun. 30, 2014
Dec. 31, 2013
Company A
   
Percent of net accounts receivable balances 53.00% 43.00%
Threshold percentage for disclosure 10.00% 10.00%
Company B
   
Percent of net accounts receivable balances 21.00% 28.00%
Threshold percentage for disclosure 10.00% 10.00%
Company C
   
Percent of net accounts receivable balances    14.00%
Threshold percentage for disclosure 10.00% 10.00%