Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2018
Office Equipment And Furniture | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Office Equipment And Furniture | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years
Leasehold improvements and fixtures  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives Lesser of estimated useful life or lease term