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Revenue and Related Matters - Schedule of Disaggregation of Revenue by Geography and Recognition Timing (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation Of Revenue [Line Items]    
Revenue $ 113,781 $ 106,345
North America [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue 90,896 88,410
Europe [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue 15,081 11,787
Asia Pacific [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue 6,393 5,051
'Other [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue $ 1,411 $ 1,097