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Fair Value Measurements and Disclosures - Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Total marketable securities | $ 84,679 | $ 82,899
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 1,858 | 3,458
Total marketable securities | 84,679 | 82,899
Total | 86,537 | 86,357
Money market funds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 858 | 959
Commercial paper and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 1,000 | 2,499
U.S. Treasury securities and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 11,709 | 17,072
Certificates of deposits [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 21,505 | 23,019
Commercial paper [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 22,323 | 22,402
Municipal securities and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 25,869 | 14,943
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 3,273 | 5,463
Cash [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 45,600 | 43,600
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 858 | 959
Total marketable securities | 0 | 0
Total | 858 | 959
Level 1 [Member] | Money market funds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 858 | 959
Level 1 [Member] | Commercial paper and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Level 1 [Member] | U.S. Treasury securities and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 1 [Member] | Certificates of deposits [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 1 [Member] | Commercial paper [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 1 [Member] | Municipal securities and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 1 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 1,000 | 2,499
Total marketable securities | 84,679 | 82,899
Total | 85,679 | 85,398
Level 2 [Member] | Money market funds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Level 2 [Member] | Commercial paper and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 1,000 | 2,499
Level 2 [Member] | U.S. Treasury securities and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 11,709 | 17,072
Level 2 [Member] | Certificates of deposits [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 21,505 | 23,019
Level 2 [Member] | Commercial paper [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 22,323 | 22,402
Level 2 [Member] | Municipal securities and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 25,869 | 14,943
Level 2 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 3,273 | 5,463
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total | 0 | 0
Level 3 [Member] | Money market funds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Level 3 [Member] | Commercial paper and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Level 3 [Member] | U.S. Treasury securities and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 3 [Member] | Certificates of deposits [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 3 [Member] | Commercial paper [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 3 [Member] | Municipal securities and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 3 [Member] | Asset-backed Securities [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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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