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Fair Value Measurements and Disclosures - Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 26, 2015 | Dec. 27, 2014
--- | --- | ---
Assets: |  |
Total marketable securities | $ 44,931 | $ 49,286
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 5,158 | 610
Total marketable securities | 44,931 | 49,286
Total | 50,089 | 49,896
Liabilities: |  |
Contingent consideration payable | 1,490 | 2,397
Money market funds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 590 | 610
Commercial paper and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 4,568 | 0
U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 24,565 | 23,034
Commercial paper, municipal securities and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 20,366 | 26,252
Cash [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 33,000 | 34,100
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 590 | 610
Total marketable securities | 4,401 | 2,497
Total | 4,991 | 3,107
Liabilities: |  |
Contingent consideration payable | 0 | 0
Level 1 [Member] | Money market funds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 590 | 610
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, U.S. Government and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 4,401 | 2,497
Level 1 [Member] | Commercial paper, municipal securities and corporate debt 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 | 4,568 | 0
Total marketable securities | 40,530 | 46,789
Total | 45,098 | 46,789
Liabilities: |  |
Contingent consideration payable | 0 | 0
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 | 4,568 | 0
Level 2 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 20,164 | 20,537
Level 2 [Member] | Commercial paper, municipal securities and corporate debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 20,366 | 26,252
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total | 0 | 0
Liabilities: |  |
Contingent consideration payable | 1,490 | 2,397
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, U.S. Government and U.S. Government agency debt securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total marketable securities | 0 | 0
Level 3 [Member] | Commercial paper, municipal securities and corporate debt 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=36462937&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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