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Leases - Weighted-Average Remaining Lease Terms and Discount Rates of Operating Leases (Details)
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Weighted-average remaining lease term of operating leases 3 years 3 months 18 days 3 years 9 months 18 days
Weighted-average discount rate of operating leases 3.50% 3.80%