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Equity Award Plans - Schedule of Stock-based Compensation Awards Granted under Stock Option Plan in Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation $ 3,538 $ 1,153 $ 8,314 $ 2,880
Cost of Revenue
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation 277 47 578 111
Sales and Marketing
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation 1,700 597 4,041 1,542
Research and Development
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation 1,139 374 2,546 903
General and Administrative
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation $ 422 $ 135 $ 1,149 $ 324