Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 34,533	$ 34,540
Less accumulated depreciation	(18,305)	(19,266)
Property, plant and equipment, net	16,228	15,274
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		147
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	7,594	7,400
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 26,939	$ 26,993