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Fair Values of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Apr. 03, 2020
Dec. 31, 2019
Liabilities    
Contingent considerations - Long-term $ 12,001 $ 16,504
Fair Value Measurements Recurring    
Assets    
Cash equivalents 9,338 9,262
Assets, fair value 9,397 9,312
Liabilities    
Liabilities, fair value 17,588 20,416
Fair Value Measurements Recurring | Prepaid Expenses and Other Current Assets    
Assets    
Foreign currency forward contracts 59 50
Fair Value Measurements Recurring | Accrued Expenses and Other Current Liabilities    
Liabilities    
Contingent considerations - Current 5,221 3,813
Foreign currency forward contracts 366 99
Fair Value Measurements Recurring | Other Liabilities    
Liabilities    
Contingent considerations - Long-term 12,001 16,504
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Cash equivalents 9,338 9,262
Assets, fair value 9,338 9,262
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2)    
Assets    
Assets, fair value 59 50
Liabilities    
Liabilities, fair value 366 99
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets    
Assets    
Foreign currency forward contracts 59 50
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Accrued Expenses and Other Current Liabilities    
Liabilities    
Foreign currency forward contracts 366 99
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3)    
Liabilities    
Liabilities, fair value 17,222 20,317
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3) | Accrued Expenses and Other Current Liabilities    
Liabilities    
Contingent considerations - Current 5,221 3,813
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3) | Other Liabilities    
Liabilities    
Contingent considerations - Long-term $ 12,001 $ 16,504