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Goodwill and Intangible Assets - Acquisition-Related Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Gross carrying amounts:    
Balance $ 9,805 $ 9,523
Foreign currency translation 195 282
Balance 10,000 9,805
Accumulated amortization:    
Balance 4,328 3,248
Amortization expense 907 964
Foreign currency translation 109 116
Balance 5,344 4,328
Net carrying values 4,656 5,477
Developed technology [Member]    
Gross carrying amounts:    
Balance 3,108 2,999
Foreign currency translation 67 109
Balance 3,175 3,108
Accumulated amortization:    
Balance 1,493 1,137
Amortization expense 308 305
Foreign currency translation 43 51
Balance 1,844 1,493
Net carrying values 1,331 1,615
Customer relationships [Member]    
Gross carrying amounts:    
Balance 2,177 2,081
Foreign currency translation 51 96
Balance 2,228 2,177
Accumulated amortization:    
Balance 983 766
Amortization expense 179 178
Foreign currency translation 30 39
Balance 1,192 983
Net carrying values 1,036 1,194
Trademarks and trade names [Member]    
Gross carrying amounts:    
Balance 871 855
Foreign currency translation 11 16
Balance 882 871
Accumulated amortization:    
Balance 567 440
Amortization expense 55 120
Foreign currency translation 7 7
Balance 629 567
Net carrying values 253 304
Patents [Member]    
Gross carrying amounts:    
Balance 43 42
Foreign currency translation 2 1
Balance 45 43
Accumulated amortization:    
Balance 24 19
Amortization expense 4 4
Foreign currency translation 1 1
Balance 29 24
Net carrying values 16 19
Media Contact Database [Member]    
Gross carrying amounts:    
Balance 3,606 3,546
Foreign currency translation 64 60
Balance 3,670 3,606
Accumulated amortization:    
Balance 1,261 886
Amortization expense 361 357
Foreign currency translation 28 18
Balance 1,650 1,261
Net carrying values $ 2,020 $ 2,345