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Fair Value Measurements and Disclosures, and Financial Instruments - Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 26, 2015 | Dec. 27, 2014
--- | --- | ---
Assets: |  |
Total marketable securities | $ 84,626 | $ 83,962
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 7,076 | 610
Total marketable securities | 43,065 | 49,286
Total | 50,141 | 49,896
Liabilities: |  |
Contingent consideration payable | 1,920 | 2,397
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 642 | 610
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member] |  |
Assets: |  |
Total cash equivalents | 6,434 | 0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 21,684 | 23,034
Fair Value, Measurements, Recurring [Member] | Commercial paper, municipal securities and corporate debt securities [Member] |  |
Assets: |  |
Total marketable securities | 21,381 | 26,252
Fair Value, Measurements, Recurring [Member] | Cash [Member] |  |
Assets: |  |
Total cash equivalents | 34,500 | 34,100
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets: |  |
Total cash equivalents | 642 | 610
Total marketable securities | 0 | 2,497
Total | 642 | 3,107
Liabilities: |  |
Contingent consideration payable | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 642 | 610
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial paper [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 0 | 2,497
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial paper, municipal securities and corporate debt securities [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets: |  |
Total cash equivalents | 6,434 | 0
Total marketable securities | 43,065 | 46,789
Total | 49,499 | 46,789
Liabilities: |  |
Contingent consideration payable | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial paper [Member] |  |
Assets: |  |
Total cash equivalents | 6,434 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 21,684 | 20,537
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial paper, municipal securities and corporate debt securities [Member] |  |
Assets: |  |
Total marketable securities | 21,381 | 26,252
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total | 0 | 0
Liabilities: |  |
Contingent consideration payable | 1,920 | 2,397
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commercial paper [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commercial paper, municipal securities and corporate debt securities [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=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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