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Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 16,413 $ 15,001
Accumulated depreciation (13,586) (12,959)
Property and equipment, net 2,827 2,042
Building and Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,498 1,200
Furniture, Fixtures and Office Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,295 1,276
Plant and Machinery    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 11,429 10,364
Purchased Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 2,191 $ 2,161