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Goodwill and Acquired Intangible Assets - Summary of Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 3,870 $ 3,870
Accumulated Amortization (807) (504)
Carrying Value $ 3,063 $ 3,366
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life 5 years 5 years
Gross Amount $ 3,600 $ 3,600
Accumulated Amortization (735) (464)
Carrying Value $ 2,865 $ 3,136
Other identifiable intangible assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life 3 years 8 months 12 days 3 years 8 months 12 days
Gross Amount $ 270 $ 270
Accumulated Amortization (72) (40)
Carrying Value $ 198 $ 230