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Leases - Schedule of Additional Information Related to Operating Lease Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating Lease Assets $ 18,545 $ 14,110
Operating Lease Liabilities $ 19,112 $ 14,466
Weighted Average Remaining Term in years 4 years 11 months 4 days 5 years 3 days
Weighted Average discount rate used to measure outstanding lease liabilities 7.84% 8.19%