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Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Total $ 25,996 $ 25,849
Less: accumulated depreciation and amortization (20,740) (19,934)
Property, Plant and Equipment, Net 5,256 5,915
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 13,709 13,719
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total 4,987 4,863
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 2,359 2,348
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total $ 4,941 $ 4,919