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Fair Value Measurements and Disclosures - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis Excluding Accrued Interest Components (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Sep. 28, 2019 | Dec. 29, 2018
--- | --- | ---
Assets: |  |
Total cash equivalents | $ 16,147 | $ 2,106
Total marketable securities | 93,101 | 40,841
Total | 109,248 | 42,947
Level 1 [Member] |  |
Assets: |  |
Total cash equivalents | 9,162 | 113
Total marketable securities | 0 | 0
Total | 9,162 | 113
Level 2 [Member] |  |
Assets: |  |
Total cash equivalents | 6,985 | 1,993
Total marketable securities | 93,101 | 40,841
Total | 100,086 | 42,834
Level 3 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total | 0 | 0
Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 9,162 | 113
Money market funds [Member] | Level 1 [Member] |  |
Assets: |  |
Total cash equivalents | 9,162 | 113
Money market funds [Member] | Level 2 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Money market funds [Member] | Level 3 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Commercial paper [Member] |  |
Assets: |  |
Total cash equivalents | 5,985 | 1,993
Total marketable securities | 16,759 | 7,932
Commercial paper [Member] | Level 1 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Commercial paper [Member] | Level 2 [Member] |  |
Assets: |  |
Total cash equivalents | 5,985 | 1,993
Total marketable securities | 16,759 | 7,932
Commercial paper [Member] | Level 3 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Certificates of deposits [Member] |  |
Assets: |  |
Total cash equivalents | 1,000 | 0
Total marketable securities | 29,007 | 9,497
Certificates of deposits [Member] | Level 1 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Certificates of deposits [Member] | Level 2 [Member] |  |
Assets: |  |
Total cash equivalents | 1,000 | 0
Total marketable securities | 29,007 | 9,497
Certificates of deposits [Member] | Level 3 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Corporate debt securities [Member] |  |
Assets: |  |
Total marketable securities | 36,927 | 15,730
Corporate debt securities [Member] | Level 1 [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Corporate debt securities [Member] | Level 2 [Member] |  |
Assets: |  |
Total marketable securities | 36,927 | 15,730
Corporate debt securities [Member] | Level 3 [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Asset-backed Securities [Member] |  |
Assets: |  |
Total marketable securities | 10,408 | 7,682
Asset-backed Securities [Member] | Level 1 [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Asset-backed Securities [Member] | Level 2 [Member] |  |
Assets: |  |
Total marketable securities | 10,408 | 7,682
Asset-backed Securities [Member] | Level 3 [Member] |  |
Assets: |  |
Total marketable securities | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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