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Geographic Information and Concentrations of Risk - Additional Information (Detail) - Net Revenues - Customer Concentration
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Customer One        
Segment Reporting Information [Line Items]        
Concentration percentage 64.20% 54.40% 56.00% 43.50%
Customer Two [Member]        
Segment Reporting Information [Line Items]        
Concentration percentage   11.80%