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Fair Values of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 28, 2019
Dec. 31, 2018
Liabilities    
Contingent consideration - Long-term $ 7,436 $ 3,376
Fair Value Measurements Recurring    
Assets    
Cash equivalents 3,184 4,288
Assets, fair value 3,231 4,303
Liabilities    
Liabilities, fair value 10,558 3,558
Fair Value Measurements Recurring | Prepaid Expenses and Other Current Assets    
Assets    
Foreign currency forward contracts 47 15
Fair Value Measurements Recurring | Accrued Expenses and Other Current Liabilities    
Liabilities    
Contingent consideration - Current 3,091  
Foreign currency forward contracts 31 182
Fair Value Measurements Recurring | Other Liabilities    
Liabilities    
Contingent consideration - Long-term 7,436 3,376
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Cash equivalents 3,184 4,288
Assets, fair value 3,184 4,288
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2)    
Assets    
Assets, fair value 47 15
Liabilities    
Liabilities, fair value 31 182
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets    
Assets    
Foreign currency forward contracts 47 15
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Accrued Expenses and Other Current Liabilities    
Liabilities    
Foreign currency forward contracts 31 182
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3)    
Liabilities    
Liabilities, fair value 10,527 3,376
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3) | Accrued Expenses and Other Current Liabilities    
Liabilities    
Contingent consideration - Current 3,091  
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3) | Other Liabilities    
Liabilities    
Contingent consideration - Long-term $ 7,436 $ 3,376