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Fair Value of Financial Instruments (Details) - Recurring - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Jun. 30, 2018
Dec. 30, 2017
Level 1        
Fair Value of Financial Instruments        
Total Assets     $ 28 $ 5,006
Level 1 | Money market funds        
Fair Value of Financial Instruments        
Cash and cash equivalents     28 5,006
Level 3        
Fair Value of Financial Instruments        
Contingent consideration liability $ 5,137 $ 549 3,291 5,137
Total Liabilities     $ 3,291 $ 5,137
Summary of changes in contingent consideration liabilities        
Beginning balance 5,137 549    
Acquisitions   2,357    
Remeasurement of acquisition-related contingent consideration (2,100) 1,155    
Accretion 254 1,328    
Payments   (299)    
Effect of foreign currency translation   47    
Ending balance $ 3,291 $ 5,137