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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 3,895,923 $ 3,440,354
Less: accumulated depreciation and amortization (3,124,710) (2,911,472)
Total property and equipment, net 771,213 528,882
Computer Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,148,140 1,074,172
Computer Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 3 years  
Computer Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 5 years  
Office Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 809,153 457,945
Office Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 3 years  
Office Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 15 years  
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 639,267 633,577
Furniture and Fixtures | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 5 years  
Furniture and Fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 15 years  
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,299,363 $ 1,274,660
Property and equipment, useful life (Textual) 3 – 15 years, or remaining lease term  
Leasehold Improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 3 years  
Leasehold Improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 15 years