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Equity-Based Compensation Expense Included in Interim Condensed Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense $ 1,760 $ 1,366 $ 4,424 $ 3,688
Cost of revenue
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 73 73 223 177
Research and development, net
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 634 468 1,489 1,327
Sales and marketing
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 393 284 1,021 723
General and administrative
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense $ 660 $ 541 $ 1,691 $ 1,461