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Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 126,615 $ 126,099
Less accumulated depreciation (100,865) (100,497)
Total property and equipment, net 25,750 25,602
Land    
Property Plant And Equipment [Line Items]    
Property and equipment - gross 875 875
Buildings    
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 17,389 17,389
Buildings | Minimum    
Property Plant And Equipment [Line Items]    
Estimated Useful Life (Years) 39 years  
Buildings | Maximum    
Property Plant And Equipment [Line Items]    
Estimated Useful Life (Years) 40 years  
Building Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 34,967 34,967
Building Improvements | Minimum    
Property Plant And Equipment [Line Items]    
Estimated Useful Life (Years) 5 years  
Building Improvements | Maximum    
Property Plant And Equipment [Line Items]    
Estimated Useful Life (Years) 40 years  
Machinery and Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 61,217 61,217
Machinery and Equipment | Minimum    
Property Plant And Equipment [Line Items]    
Estimated Useful Life (Years) 3 years  
Machinery and Equipment | Maximum    
Property Plant And Equipment [Line Items]    
Estimated Useful Life (Years) 15 years  
Furniture, fixtures and office equipment    
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 2,954 2,954
Furniture, fixtures and office equipment | Minimum    
Property Plant And Equipment [Line Items]    
Estimated Useful Life (Years) 5 years  
Furniture, fixtures and office equipment | Maximum    
Property Plant And Equipment [Line Items]    
Estimated Useful Life (Years) 10 years  
Computer Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 8,355 8,355
Estimated Useful Life (Years) 3 years  
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 858 $ 342