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Equity-Based Compensation Expense Included in Interim Condensed Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense $ 1,609 $ 827 $ 3,083 $ 1,676
Cost of revenues        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 54 42 114 77
Research and development, net        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 775 494 1,421 885
Sales and marketing        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 255 165 502 244
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense $ 525 $ 126 $ 1,046 $ 470