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Geographic Information and Concentrations of Risk - Additional Information (Detail) - Net Revenues - Customer Concentration
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Customer One        
Segment Reporting Information [Line Items]        
Concentration percentage 56.50% 36.80% 52.00% 37.80%
Customer Two [Member]        
Segment Reporting Information [Line Items]        
Concentration percentage 12.00% 11.80%