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Fair Value Measurements and Disclosures - Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 30, 2017
--- | --- | ---
Assets: |  |
Total marketable securities | $ 62,501 | $ 82,130
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 62,502 | 82,130
Total | 78,045 | 82,386
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Total | 9,563 | 256
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 62,502 | 82,130
Total | 68,482 | 82,130
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Total | 0 | 0
Money market funds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 9,563 | 256
Money market funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 9,563 | 256
Money market funds [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Money market funds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Commercial paper and Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 5,980 | 0
Commercial paper and Certificates of deposit [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Commercial paper and Certificates of deposit [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 5,980 | 0
Commercial paper and Certificates of deposit [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 1,499 | 1,495
U.S. Government agency debt securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
U.S. Government agency debt securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 1,499 | 1,495
U.S. Government agency debt securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Certificates of deposits [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 9,000 | 14,497
Certificates of deposits [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Certificates of deposits [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 9,000 | 14,497
Certificates of deposits [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Commercial paper [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 4,974 | 7,949
Commercial paper [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Commercial paper [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 4,974 | 7,949
Commercial paper [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 36,677 | 47,968
Corporate debt securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Corporate debt securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 36,677 | 47,968
Corporate debt securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 10,352 | 10,221
Asset-backed Securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Asset-backed Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 10,352 | 10,221
Asset-backed Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [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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