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Commitments and Contingencies - Summary of Weighted Average Remaining Lease Term and Weighted Average Discount Rate (Detail)
Sep. 30, 2020
Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]    
Weighted average remaining lease term 9 years 3 months 18 days 9 years 8 months 12 days
Weighted average discount rate 10.10% 10.10%