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Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]    
Land $ 3,600 $ 3,600
Buildings and improvements 45,905 45,791
Machinery and equipment 233,635 220,405
Furniture and fixtures 8,429 8,231
Construction in-progress and deposits 17,987 4,362
Property, plant and equipment, gross, total 309,556 282,389
Accumulated depreciation and amortization (239,162) (229,698)
Right of use asset — net 4,449 4,261
Net balance $ 74,843 $ 56,952