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Fair Value of Financial Instruments (Details) - Recurring - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2016
Apr. 01, 2017
Dec. 31, 2016
Level 1        
Fair Value of Financial Instruments        
Total Assets     $ 3 $ 10,024
Level 1 | Money market funds        
Fair Value of Financial Instruments        
Cash and cash equivalents     3 10,024
Level 3        
Fair Value of Financial Instruments        
Contingent consideration $ 549 $ 773 3,455 549
Total Liabilities     $ 3,455 $ 549
Summary of changes in contingent consideration liability        
Beginning Balance 549 773    
Acquisitions 2,898      
Remeasurement of acquisition-related contingent consideration 1 71    
Payments   (292)    
Effects of foreign currency translation 7 (3)    
Ending Balance $ 3,455 $ 549