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Property and Equipment (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 11,261,906 $ 8,212,846
Less: accumulated depreciation and amortization (9,151,135) (6,622,835)
Total 2,110,771 1,590,011
Furniture and fixtures
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 421,425 421,425
Equipment
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,473,813 2,095,825
Software
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 8,018,509 5,382,424
Leasehold improvements
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 348,159 $ 313,172