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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Dec. 29, 2018
Income Taxes [Line Items]      
Provision for income taxes $ 553,000 $ 160,000  
Income tax provision on earnings of subsidiaries 362,000    
Inland Revenue, Singapore (IRAS)      
Income Taxes [Line Items]      
Deposit for contested taxes and related interest 730,000   $ 723,000
Foreign Tax Authority | Singapore      
Income Taxes [Line Items]      
Income tax charge (benefit) $ 191,000 $ 145,000