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Major Customers Data as Percentage of Total Revenues (Detail) - Revenue - Customer Concentration Risk
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Customer A        
Revenue, Major Customer [Line Items]        
Percentage of total revenues 20.00% 27.00% 22.00% 27.00%
Customer B        
Revenue, Major Customer [Line Items]        
Percentage of total revenues 18.00% 21.00% 17.00% 19.00%
Customer C        
Revenue, Major Customer [Line Items]        
Percentage of total revenues 12.00% 0.00% 0.00% [1] 0.00%
Customer D        
Revenue, Major Customer [Line Items]        
Percentage of total revenues 21.00% 0.00% [1] 0.00% [1] 0.00% [1]
[1] *) Less than 10%