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Fair Value Measurements and Disclosures (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified | Mar. 29, 2014 | Dec. 28, 2013
--- | --- | ---
Cash [Member] |  |
Assets: |  |
Total cash equivalents | $ 38,200 | $ 43,100
Level 1 [Member] |  |
Assets: |  |
Total cash equivalents | 586 | 876
Total marketable securities | 5,023 | 5,036
Total assets | 5,609 | 5,912
Liabilities: |  |
Contingent consideration payable | 0 | 0
Level 1 [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 586 | 876
Level 1 [Member] | U.S. Treasury securities and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 5,023 | 5,036
Level 1 [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Level 2 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 750
Total marketable securities | 44,181 | 43,061
Total assets | 44,181 | 43,811
Liabilities: |  |
Contingent consideration payable | 0 | 0
Level 2 [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Level 2 [Member] | U.S. Treasury securities and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 11,772 | 11,980
Level 2 [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 750
Total marketable securities | 32,409 | 31,081
Level 3 [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total assets | 0 | 0
Liabilities: |  |
Contingent consideration payable | 2,678 | 2,783
Level 3 [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Level 3 [Member] | U.S. Treasury securities and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 3 [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total [Member] |  |
Assets: |  |
Total cash equivalents | 586 | 1,626
Total marketable securities | 49,204 | 48,097
Total assets | 49,790 | 49,723
Liabilities: |  |
Contingent consideration payable | 2,678 | 2,783
Total [Member] | Money market funds [Member] |  |
Assets: |  |
Total cash equivalents | 586 | 876
Total [Member] | U.S. Treasury securities and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Total marketable securities | 16,795 | 17,016
Total [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 750
Total marketable securities | $ 32,409 | $ 31,081

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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=25499696&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=28360136&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=6871852&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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- Definition Fair value of financial and nonfinancial obligations. + 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=25499696&loc=d3e19207-110258 + Details
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