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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 | Jun. 29, 2019 | Dec. 29, 2018
--- | --- | ---
Money Market Funds |  |
Assets: |  |
Assets, Fair Value Measurements | $ 14,350 | $ 20,708
Earn Out Liability |  |
Liabilities: |  |
Liabilities, Fair Value Measurements | 262 | 334
Level 1 | Money Market Funds |  |
Assets: |  |
Assets, Fair Value Measurements | 14,350 | 20,708
Level 3 | Earn Out Liability |  |
Liabilities: |  |
Liabilities, Fair Value Measurements | $ 262 | $ 334

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