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Balance Sheet Components - Short-Term Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Short-term marketable securities term | 2 years |
Short-term marketable securities: |  |
Maturing within one year | $ 0 | $ 7,454
Maturing between one and two years | 0 | 2,170
Total marketable securities | $ 0 | $ 9,624

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