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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Liabilities, Current [Abstract]    
Payroll and related benefits $ 13,728 $ 14,769
Professional fees 1,831 978
Sales tax payable 2,858 2,400
Other 4,193 4,080
Accrued expenses and other current liabilities, Total $ 22,610 $ 22,227