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Segment Information - Revenue Information by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue from External Customer [Line Items]        
Revenue $ 143,232 $ 128,715 $ 270,765 $ 243,238
United States [Member]        
Revenue from External Customer [Line Items]        
Revenue 94,656 84,458 181,141 163,449
International [Member]        
Revenue from External Customer [Line Items]        
Revenue $ 48,576 $ 44,257 $ 89,624 $ 79,789