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Fair Values of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Cash equivalents $ 11,047 $ 9,262
Assets, fair value 11,074 9,312
Liabilities    
Liabilities, fair value 11,556 20,416
Prepaid Expenses and Other Current Assets    
Assets    
Foreign currency forward contracts 27 50
Accrued Expenses and Other Current Liabilities    
Liabilities    
Contingent considerations - Current 4,280 3,813
Foreign currency forward contracts   99
Other Liabilities    
Liabilities    
Contingent considerations - Long-term 7,276 16,504
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Cash equivalents 11,047 9,262
Assets, fair value 11,047 9,262
Significant Other Observable Inputs (Level 2)    
Assets    
Assets, fair value 27 50
Liabilities    
Liabilities, fair value   99
Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets    
Assets    
Foreign currency forward contracts 27 50
Significant Other Observable Inputs (Level 2) | Accrued Expenses and Other Current Liabilities    
Liabilities    
Foreign currency forward contracts   99
Significant Other Unobservable Inputs (Level 3)    
Liabilities    
Liabilities, fair value 11,556 20,317
Significant Other Unobservable Inputs (Level 3) | Accrued Expenses and Other Current Liabilities    
Liabilities    
Contingent considerations - Current 4,280 3,813
Significant Other Unobservable Inputs (Level 3) | Other Liabilities    
Liabilities    
Contingent considerations - Long-term $ 7,276 $ 16,504