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Concentrations (Details) - customer
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Net sales      
Concentration Risk      
Number of customers 1 2  
Net sales | Customer one      
Concentration Risk      
Customer's concentration risk percentage 35.00% 33.00%  
Net sales | Customer two      
Concentration Risk      
Customer's concentration risk percentage   11.00%  
Accounts receivable      
Concentration Risk      
Number of customers 1   1
Accounts receivable | Customer one      
Concentration Risk      
Customer's concentration risk percentage 37.00%   48.00%