Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment (Details)

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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross $ 105,497 $ 98,213  
Less accumulated depreciation 64,807 57,288  
Property, plant and equipment, net 40,690 40,925  
Depreciation expense 7,578 6,412 $ 5,295
Land      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross 63 63  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross 1,921 1,163  
Buildings      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross 214 412  
Machinery, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross 100,300 92,931  
Construction-in-progress      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross $ 2,999 $ 3,644