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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 23,336 $ 19,297
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (17,438) (15,554)
Property, plant and equipment, net 5,898 3,743
Land, buildings and leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,468 2,197
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 9,678 7,022
Computer equipment and software [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 9,685 8,819
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,390 1,139
Automobiles [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 115 $ 120