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Summary of Significant Accounting Policies - Accounts Receivable, net (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable, net    
Allowance for uncollectible receivables $ 0 $ 0
Allowance for expected sales deductions $ 3,800,000 $ 4,100,000
Revenues | Customer Concentration Risk    
Concentration risk percentage    
Concentration risk percentage 96.00%  
Revenues | Customer Concentration Risk | Customer A    
Concentration risk percentage    
Concentration risk percentage 26.00%  
Revenues | Customer Concentration Risk | Customer B    
Concentration risk percentage    
Concentration risk percentage 32.00%  
Revenues | Customer Concentration Risk | Customer C    
Concentration risk percentage    
Concentration risk percentage 38.00%  
Accounts Receivable | Customer Concentration Risk    
Concentration risk percentage    
Concentration risk percentage 97.00%  
Accounts Receivable | Customer Concentration Risk | Customer A    
Concentration risk percentage    
Concentration risk percentage 40.00%  
Accounts Receivable | Customer Concentration Risk | Customer B    
Concentration risk percentage    
Concentration risk percentage 28.00%  
Accounts Receivable | Customer Concentration Risk | Customer C    
Concentration risk percentage    
Concentration risk percentage 29.00%