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Goodwill and Intangible Assets - Acquisition-Related Intangible Assets (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Gross carrying amounts:    
Balance $ 10,000  
Foreign currency translation 144  
Balance 10,144  
Accumulated amortization:    
Balance 5,344  
Amortization expense 465  
Foreign currency translation 88  
Balance 5,897  
Net carrying values 4,247 $ 4,656
Developed technology [Member]    
Gross carrying amounts:    
Balance 3,175  
Foreign currency translation 59  
Balance 3,234  
Accumulated amortization:    
Balance 1,844  
Amortization expense 159  
Foreign currency translation 39  
Balance 2,042  
Net carrying values 1,192  
Customer relationships [Member]    
Gross carrying amounts:    
Balance 2,228  
Foreign currency translation 54  
Balance 2,282  
Accumulated amortization:    
Balance 1,192  
Amortization expense 93  
Foreign currency translation 30  
Balance 1,315  
Net carrying values 967  
Trademarks and trade names [Member]    
Gross carrying amounts:    
Balance 882  
Foreign currency translation 8  
Balance 890  
Accumulated amortization:    
Balance 629  
Amortization expense 28  
Foreign currency translation 5  
Balance 662  
Net carrying values 228  
Patents [Member]    
Gross carrying amounts:    
Balance 45  
Foreign currency translation 1  
Balance 46  
Accumulated amortization:    
Balance 29  
Amortization expense 2  
Foreign currency translation 1  
Balance 32  
Net carrying values 14  
Media Contact Database [Member]    
Gross carrying amounts:    
Balance 3,670  
Foreign currency translation 22  
Balance 3,692  
Accumulated amortization:    
Balance 1,650  
Amortization expense 183  
Foreign currency translation 13  
Balance 1,846  
Net carrying values $ 1,846