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Segment Information - Revenue Information by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from External Customer [Line Items]        
Revenue $ 138,081 $ 133,143 $ 408,846 $ 376,381
United States [Member]        
Revenue from External Customer [Line Items]        
Revenue 91,868 92,838 273,009 256,287
International [Member]        
Revenue from External Customer [Line Items]        
Revenue $ 46,213 $ 40,305 $ 135,837 $ 120,094