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Goodwill and Intangible Assets - Acquisition-Related Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Gross carrying amounts:    
Balance $ 10,000  
Foreign currency translation 38  
Balance 10,038  
Accumulated amortization:    
Balance 5,344  
Amortization expense 231  
Foreign currency translation 26  
Balance 5,601  
Net carrying values 4,437 $ 4,656
Developed technology [Member]    
Gross carrying amounts:    
Balance 3,175  
Foreign currency translation 18  
Balance 3,193  
Accumulated amortization:    
Balance 1,844  
Amortization expense 79  
Foreign currency translation 12  
Balance 1,935  
Net carrying values 1,258  
Customer relationships [Member]    
Gross carrying amounts:    
Balance 2,228  
Foreign currency translation 18  
Balance 2,246  
Accumulated amortization:    
Balance 1,192  
Amortization expense 46  
Foreign currency translation 10  
Balance 1,248  
Net carrying values 998  
Trademarks and trade names [Member]    
Gross carrying amounts:    
Balance 882  
Foreign currency translation 2  
Balance 884  
Accumulated amortization:    
Balance 629  
Amortization expense 14  
Foreign currency translation 1  
Balance 644  
Net carrying values 240  
Patents [Member]    
Gross carrying amounts:    
Balance 45  
Foreign currency translation 1  
Balance 46  
Accumulated amortization:    
Balance 29  
Amortization expense 1  
Foreign currency translation 1  
Balance 31  
Net carrying values 15  
Media Contact Database [Member]    
Gross carrying amounts:    
Balance 3,670  
Foreign currency translation (1)  
Balance 3,669  
Accumulated amortization:    
Balance 1,650  
Amortization expense 91  
Foreign currency translation 2  
Balance 1,743  
Net carrying values $ 1,926