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Fair Value Measurement - Reconciliation of the Changes in the Company's Earn-Out - Cash (Level 3 Liabilities) Balance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Reconciliation of the changes in the Company's earn-out - cash (Level 3 liabilities) balance    
Balance as of beginning of the period $ 334 $ 572
Payments against earn-out (381) (387)
Change in fair value of earn-out liability $ 47 149
Balance as of the end of the period   $ 334