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Summary of Significant Accounting Policies - Accounts Receivable, net (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
May 03, 2013
Accounts Receivable, net      
Allowance for uncollectible receivables $ 42,000    
Accounts receivable written off   $ 0  
Allowance for expected sales discounts $ 5,600,000 $ 3,800,000  
Revenues | Customer Concentration Risk      
Concentration risk percentage      
Concentration risk percentage 96.00%    
Revenues | Customer Concentration Risk | Customer A      
Concentration risk percentage      
Concentration risk percentage 29.00%    
Revenues | Customer Concentration Risk | Customer B      
Concentration risk percentage      
Concentration risk percentage 30.00%    
Revenues | Customer Concentration Risk | Customer C      
Concentration risk percentage      
Concentration risk percentage 37.00%    
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 43.00%    
Accounts Receivable | Customer Concentration Risk | Customer B      
Concentration risk percentage      
Concentration risk percentage 26.00%    
Accounts Receivable | Customer Concentration Risk | Customer C      
Concentration risk percentage      
Concentration risk percentage 28.00%    
7.50% Convertible Senior Secured Notes due 2019      
Deferred Financing Costs      
Interest rate (as a percent) 7.50%   7.50%