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Fair Value Measurements and Disclosures - Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Total marketable securities | $ 82,130 | $ 82,899
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 256 | 3,458
Total marketable securities | 82,130 | 82,899
Total | 82,386 | 86,357
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 256 | 959
Total marketable securities | 0 | 0
Total | 256 | 959
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 2,499
Total marketable securities | 82,130 | 82,899
Total | 82,130 | 85,398
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total | 0 | 0
Money market funds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 256 | 959
Money market funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 256 | 959
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 corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 2,499
Commercial paper and corporate debt securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Commercial paper and corporate debt securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 2,499
Commercial paper and corporate debt securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
U.S. Treasury securities and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 1,495 | 17,072
U.S. Treasury securities and U.S. Government agency debt securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
U.S. Treasury securities and U.S. Government agency debt securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 1,495 | 17,072
U.S. Treasury securities and 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 | 14,497 | 23,019
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 | 14,497 | 23,019
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 | 7,949 | 22,402
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 | 7,949 | 22,402
Commercial paper [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Municipal securities and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 47,968 | 14,943
Municipal securities and corporate debt securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Municipal securities and corporate debt securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 47,968 | 14,943
Municipal securities and 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 | 10,221 | 5,463
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 | 10,221 | 5,463
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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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