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Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 14,936 $ 14,707
Accumulated depreciation (12,267) (12,083)
Property and equipment, net 2,669 2,624
Building and Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,259 1,250
Furniture, Fixtures and Office Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,870 1,806
Plant and Machinery    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 9,625 9,484
Purchased Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 2,182 $ 2,167