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Property, Equipment and Software - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Abstract]      
Depreciation expense $ 3,400,000 $ 3,300,000 $ 3,800,000
Amortization of capitalized software development costs 1,400,000 531,000 368,000
Capitalized software development costs $ 6,000,000.0 $ 8,300,000 $ 900,000