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Geographic Information and Concentrations of Risk - Narrative (Details) - Customer Concentration
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Net Revenues | Customer One          
Segment Reporting Information [Line Items]          
Concentration percentage 46.90% 48.00% 46.60% 49.60%  
Net Revenues | Customer Two          
Segment Reporting Information [Line Items]          
Concentration percentage   14.90%   11.40%  
Accounts Receivable | Customer One          
Segment Reporting Information [Line Items]          
Concentration percentage     35.90%   23.90%