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Commitment and Contingencies - Components of Lease Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease, Cost [Abstract]    
Operating lease costs $ 9,188 $ 6,419
Variable lease costs 3,577 2,825
Total lease costs $ 12,765 $ 9,244