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Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Property Plant And Equipment [Line Items]      
Property and equipment, gross $ 17,491 $ 16,413  
Accumulated depreciation (13,723) (13,586)  
Property and equipment, net 3,768 2,827 $ 2,827
Building and Leasehold Improvements      
Property Plant And Equipment [Line Items]      
Property and equipment, gross 1,450 1,498  
Furniture, Fixtures and Office Equipment      
Property Plant And Equipment [Line Items]      
Property and equipment, gross 1,311 1,295  
Plant and Machinery      
Property Plant And Equipment [Line Items]      
Property and equipment, gross 12,541 11,429  
Purchased Software      
Property Plant And Equipment [Line Items]      
Property and equipment, gross $ 2,189 $ 2,191