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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Income Taxes [Line Items]            
Provision for income taxes $ 173 $ 192 $ 192 $ 1,144 $ 717  
Income tax provision on earnings of subsidiaries 42     605    
Inland Revenue, Singapore (IRAS)            
Income Taxes [Line Items]            
Deposit for contested taxes and related interest 713     713   $ 723
Foreign Tax Authority | Singapore            
Income Taxes [Line Items]            
Income tax charge (benefit) $ 130 $ 158   $ 534 $ 615