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Business Combinations - Summary of Change in Contingent Consideration (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Combination, Contingent Consideration Arrangements [Abstract]        
Beginning Balance     $ 2,451  
Payments made during the period     (406)  
Change in fair value during the period $ (500) $ (60) (1,526) $ 390
Ending Balance $ 519   $ 519