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Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total $ 28,857 $ 28,483
Less: accumulated depreciation and amortization (21,830) (21,294)
Property, Plant and Equipment, Net 7,027 7,189
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 13,559 13,574
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total 7,700 7,291
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 2,267 2,276
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total $ 5,331 $ 5,342