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Goodwill and Intangible Assets - Acquisition-Related Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Gross carrying amounts:    
Balance $ 9,805 $ 9,523
Foreign currency translation (517) 178
Balance 9,288 9,701
Accumulated amortization:    
Balance 4,329 3,248
Amortization expense 228 242
Foreign currency translation (251) 60
Balance 4,306 3,550
Developed technology [Member]    
Gross carrying amounts:    
Balance 3,108 2,999
Foreign currency translation (206) 61
Balance 2,902 3,060
Accumulated amortization:    
Balance 1,493 1,137
Amortization expense 78 77
Foreign currency translation (111) 24
Balance 1,460 1,238
Customer relationships [Member]    
Gross carrying amounts:    
Balance 2,177 2,081
Foreign currency translation (184) 47
Balance 1,993 2,128
Accumulated amortization:    
Balance 983 766
Amortization expense 45 45
Foreign currency translation (87) 16
Balance 941 827
Trademarks and trade names [Member]    
Gross carrying amounts:    
Balance 871 855
Foreign currency translation (29) 10
Balance 842 865
Accumulated amortization:    
Balance 567 440
Amortization expense 14 30
Foreign currency translation (15) 4
Balance 566 474
Patents [Member]    
Gross carrying amounts:    
Balance 44 42
Foreign currency translation (3) 1
Balance 41 43
Accumulated amortization:    
Balance 24 19
Amortization expense 1 1
Foreign currency translation (2)  
Balance 23 20
Media Contact Database [Member]    
Gross carrying amounts:    
Balance 3,605 3,546
Foreign currency translation (95) 59
Balance 3,510 3,605
Accumulated amortization:    
Balance 1,262 886
Amortization expense 90 89
Foreign currency translation (36) 16
Balance $ 1,316 $ 991