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The Company and Basis of Presentation - Liquidity (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 28, 2018
Mar. 31, 2019
Dec. 30, 2018
Liquidity [Line Items]      
Cash, cash equivalents and restricted cash   $ 23,200  
Revolving line of credit   15,000 $ 15,000
Heritage Bank | Revolving Line of Credit      
Liquidity [Line Items]      
Revolving line of credit   $ 15,000 $ 15,000
Line of credit facility, maturity date Sep. 28, 2020 Sep. 28, 2020