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Major Customers as a Percentage of Net Accounts Receivable Balances (Details)
Jun. 30, 2015
Dec. 31, 2014
Company A    
Percent of net accounts receivable balances 35.00% 42.00%
Threshold percentage for disclosure 10.00% 10.00%
Company B    
Percent of net accounts receivable balances 30.00% 25.00%
Threshold percentage for disclosure 10.00% 10.00%
Company C    
Percent of net accounts receivable balances 21.00% 14.00%
Threshold percentage for disclosure 10.00% 10.00%