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Disaggregated Revenues - Summary of Disaggregated revenues By Market Group (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Sales $ 48,502 $ 55,739
Consumer [Member]    
Disaggregation of Revenue [Line Items]    
Sales 37,129 43,000
Automotive [Member]    
Disaggregation of Revenue [Line Items]    
Sales 7,463 8,873
Enterprise [Member]    
Disaggregation of Revenue [Line Items]    
Sales $ 3,910 $ 3,866