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Fair Value Measurements and Disclosures, and Financial Instruments - Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 27, 2015 | Dec. 27, 2014
--- | --- | ---
Assets: |  |
Total marketable securities | $ 74,789 | $ 83,962
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 1,699 | 610
Total marketable securities | 48,368 | 49,286
Total | 50,067 | 49,896
Liabilities: |  |
Contingent consideration payable | 2,073 | 2,397
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 1,699 | 610
Fair Value, Measurements, Recurring [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 22,532 | 23,034
Fair Value, Measurements, Recurring [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Total marketable securities | 25,836 | 26,252
Fair Value, Measurements, Recurring [Member] | Cash [Member] |  |
Assets: |  |
Total cash equivalents | 24,700 | 34,100
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets: |  |
Total cash equivalents | 1,699 | 610
Total marketable securities | 2,500 | 2,497
Total | 4,199 | 3,107
Liabilities: |  |
Contingent consideration payable | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 1,699 | 610
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 | 2,500 | 2,497
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 45,868 | 46,789
Total | 45,868 | 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] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 20,032 | 20,537
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Total marketable securities | 25,836 | 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 | 2,073 | 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] | 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 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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- 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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