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Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total $ 29,037 $ 27,291
Less: accumulated depreciation and amortization (21,715) (21,894)
Property, Plant and Equipment, Net 7,322 5,397
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 14,332 14,558
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total 6,911 5,685
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 2,452 2,119
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total $ 5,342 $ 4,929