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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 45,065 $ 44,758
Less accumulated depreciation (22,865) (21,358)
Property, plant and equipment, net 22,200 23,400
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,623 1,627
Building and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 18,185 18,063
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 25,257 $ 25,068