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Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total $ 26,063 $ 25,795
Less: accumulated depreciation and amortization (21,307) (21,072)
Property, Plant and Equipment, Net 4,756 4,723
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 13,725 13,437
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total 5,311 5,089
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 2,120 2,313
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total $ 4,907 $ 4,956