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Commitments and Contingencies - Weighted Average Lease Term and Weighted Average Discount Rate (Details)
Sep. 30, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Weighted average remaining operating lease term (in years) 4 years 3 months 18 days 5 years 1 month 6 days
Weighted average discount rate 7.70% 7.70%