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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - Customer Concentration Risk [Member] - customer
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Number of major customers 2 2  
Concentration risk, percentage 34.00% 39.00%  
Revenue [Member] | Health & Wellness [Member]      
Concentration Risk [Line Items]      
Number of major customers 2 3 3
Concentration risk, percentage 30.00% 50.00% 50.00%