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Summary of Significant Accounting Policies (Estimated Useful Lives of Fixed Assets) (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Office buildings [Member]  
Property, Plant and Equipment [Line Items]  
Fixed assets, residual value $ 0
Estimated Useful Lives (years) 36-47
Leasehold improvements [Member]  
Property, Plant and Equipment [Line Items]  
Fixed assets, residual value $ 0
Estimated Useful Lives (years) Lesser of term of the lease or the estimated useful lives of the assets
Vehicles [Member]  
Property, Plant and Equipment [Line Items]  
Fixed assets, residual value $ 0
Estimated Useful Lives (years) 4
Office furniture [Member]  
Property, Plant and Equipment [Line Items]  
Fixed assets, residual value $ 0
Estimated Useful Lives (years) 5
Computer equipment and hardware [Member]  
Property, Plant and Equipment [Line Items]  
Fixed assets, residual value $ 0
Estimated Useful Lives (years) 4-5