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Goodwill and Intangible Assets - Schedule of Change in Gross Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 97,866 $ 88,420
Goodwill, ending balance 213,601 97,866
NetFort Technologies    
Goodwill [Roll Forward]    
Acquisition   $ 9,446
Divvy Cloud Corporation    
Goodwill [Roll Forward]    
Acquisition $ 115,735