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Segment Information - Revenue Information by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue from External Customer [Line Items]    
Revenue $ 127,533 $ 114,523
United States [Member]    
Revenue from External Customer [Line Items]    
Revenue 86,485 78,991
International [Member]    
Revenue from External Customer [Line Items]    
Revenue $ 41,048 $ 35,532