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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense $ 2,178 $ 1,609 $ 4,127 $ 3,083
Cost of revenues        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 114 54 205 114
Research and development, net        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 972 775 1,843 1,421
Sales and marketing        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 370 255 659 502
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense $ 722 $ 525 $ 1,420 $ 1,046