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Balance Sheet Details - Trade and Other Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables and other $ 24,472 $ 25,397
Unbilled costs and accrued profits 4,069 2,164
Income tax receivable 78 156
Less: allowance for doubtful accounts 0 0
Trade and other accounts receivable, net of allowances of $0 at both December 29, 2018 and December 30, 2017 $ 28,619 $ 27,717