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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 19,369 $ 16,826  
Accumulated depreciation (15,259) (13,252)  
Property, Plant and equipment, net 4,110 3,574  
Depreciation 2,000 1,731 $ 2,190
Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 15,494 13,374  
Office Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 991 924  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 2,884 $ 2,528