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Basis of Presentation and Summary of Significant Accounting Policies - Summary of Revenue Comprised of Major Product and Service Lines (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Products and license $ 20,512 $ 19,578
Services:    
Subscriptions 34,953  
Maintenance and Support 25,226  
Professional services and training 3,553  
Services 63,732 52,730
Total net revenue 84,244 72,308
Major Product and Service Lines [Member]    
Disaggregation Of Revenue [Line Items]    
Products and license 20,512 19,578
Services:    
Subscriptions 34,953 27,252
Maintenance and Support 25,226 21,980
Professional services and training 3,553 3,498
Services 63,732 52,730
Total net revenue $ 84,244 $ 72,308