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Leases - Narrative (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Available leasehold tenant improvement allowance $ 11,800,000  
Finance leases 0 $ 0
Subleases $ 0 $ 0
Five Year Renewal Option    
Lessee, Lease, Description [Line Items]    
Lease renewal term 5 years  
March 2020 Lease Amendment    
Lessee, Lease, Description [Line Items]    
Available leasehold tenant improvement allowance $ 700,000