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Fair Value Measurements - Financial Assets and Liabilities Measured and Recognized at Fair Value on a Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands | Sep. 29, 2018 | Dec. 30, 2017
--- | --- | ---
Money Market Funds |  |
Assets: |  |
Assets, Fair Value Measurements | $ 22,844 | $ 20,950
Earn Out Liability |  |
Liabilities: |  |
Liabilities, Fair Value Measurements | 364 | 572
Level 1 | Money Market Funds |  |
Assets: |  |
Assets, Fair Value Measurements | 22,844 | 20,950
Level 3 | Earn Out Liability |  |
Liabilities: |  |
Liabilities, Fair Value Measurements | $ 364 | $ 572

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