Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Additional Information (Detail)

v3.10.0.1
Segment Information - Additional Information (Detail) - Sales Revenue, Net - Customer
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Customer Concentration Risk | United States        
Segment Reporting Information [Line Items]        
Concentration Risk Percentage 64.00% 63.00% 60.00% 64.00%
Customer Concentration Risk | International        
Segment Reporting Information [Line Items]        
Concentration Risk Percentage 36.00% 37.00% 40.00% 36.00%
Geographic Concentration Risk | International        
Segment Reporting Information [Line Items]        
Number of customers which represented more than 10% of the Company's revenue 0 0 0 0