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Property Plant And Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ (83,024) $ (80,206)
Property, plant and equipment, net 60,498 63,158
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,204 3,204
Leaseholds and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,820 3,820
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 72,870 72,772
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 61,841 61,871
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 1,787 $ 1,697