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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