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Major Customers Data as Percentage of Total Revenues (Detail) - Revenue - Customer Concentration Risk
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Customer A    
Revenue, Major Customer [Line Items]    
Percentage of total revenues 25.00% 24.00%
Customer B    
Revenue, Major Customer [Line Items]    
Percentage of total revenues 0.00% [1] 17.00%
Customer C    
Revenue, Major Customer [Line Items]    
Percentage of total revenues 17.00% 16.00%
Customer D    
Revenue, Major Customer [Line Items]    
Percentage of total revenues 11.00% 0.00% [1]
[1] *) Less than 10%