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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2014
Dec. 28, 2013
Earn-Out liability
   
Financial assets and liabilities measured and recognized at fair value on a recurring basis    
Liabilities, Fair Value Measurements $ 629 $ 624
Level 1 | Earn-Out liability
   
Financial assets and liabilities measured and recognized at fair value on a recurring basis    
Liabilities, Fair Value Measurements      
Level 2 | Earn-Out liability
   
Financial assets and liabilities measured and recognized at fair value on a recurring basis    
Liabilities, Fair Value Measurements      
Level 3 | Earn-Out liability
   
Financial assets and liabilities measured and recognized at fair value on a recurring basis    
Liabilities, Fair Value Measurements 629 624
Money market funds
   
Financial assets and liabilities measured and recognized at fair value on a recurring basis    
Assets, Fair Value Measurements 13,044 12,742
Money market funds | Level 1
   
Financial assets and liabilities measured and recognized at fair value on a recurring basis    
Assets, Fair Value Measurements 13,044 12,742
Money market funds | Level 2
   
Financial assets and liabilities measured and recognized at fair value on a recurring basis    
Assets, Fair Value Measurements      
Money market funds | Level 3
   
Financial assets and liabilities measured and recognized at fair value on a recurring basis    
Assets, Fair Value Measurements