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Fair Value of Financial Instruments (Details) - Recurring - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 01, 2017
Dec. 31, 2016
Jul. 01, 2017
Dec. 31, 2016
Level 1        
Fair Value of Financial Instruments        
Total Assets     $ 4 $ 10,024
Level 1 | Money market funds        
Fair Value of Financial Instruments        
Cash and cash equivalents     4 10,024
Level 3        
Fair Value of Financial Instruments        
Contingent consideration liability $ 549 $ 773 2,946 549
Total Liabilities     $ 2,946 $ 549
Summary of changes in contingent consideration liability        
Beginning Balance 549 773    
Acquisitions 2,357      
Remeasurement of acquisition-related contingent consideration (296) 71    
Accretion 589      
Payments (299) (292)    
Effects of foreign currency translation 46 (3)    
Ending Balance $ 2,946 $ 549