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Summary of Significant Accounting Policies - Fixed Assets and Leases (Details) - Leasehold Improvements [Member]
6 Months Ended
Jun. 30, 2020
Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P2Y
Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P4Y