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Goodwill and Intangible Assets - Acquisition-Related Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Gross carrying amounts:    
Balance $ 9,523 $ 10,045
Foreign currency translation 282 (522)
Balance 9,805 9,523
Accumulated amortization:    
Balance 3,248 2,439
Amortization expense 964 996
Foreign currency translation 116 (187)
Balance 4,328 3,248
Developed technology [Member]    
Gross carrying amounts:    
Balance 2,999 3,204
Foreign currency translation 109 (205)
Balance 3,108 2,999
Accumulated amortization:    
Balance 1,137 902
Amortization expense 305 317
Foreign currency translation 51 (82)
Balance 1,493 1,137
Customer relationships [Member]    
Gross carrying amounts:    
Balance 2,081 2,264
Foreign currency translation 96 (183)
Balance 2,177 2,081
Accumulated amortization:    
Balance 766 645
Amortization expense 178 185
Foreign currency translation 39 (64)
Balance 983 766
Trademarks and trade names [Member]    
Gross carrying amounts:    
Balance 855 884
Foreign currency translation 16 (29)
Balance 871 855
Accumulated amortization:    
Balance 440 330
Amortization expense 120 122
Foreign currency translation 7 (12)
Balance 567 440
Patents [Member]    
Gross carrying amounts:    
Balance 42 46
Foreign currency translation 1 (4)
Balance 43 42
Accumulated amortization:    
Balance 19 15
Amortization expense 4 5
Foreign currency translation 1 (1)
Balance 24 19
Media Contact Database [Member]    
Gross carrying amounts:    
Balance 3,546 3,647
Foreign currency translation 60 (101)
Balance 3,606 3,546
Accumulated amortization:    
Balance 886 547
Amortization expense 357 367
Foreign currency translation 18 (28)
Balance $ 1,261 $ 886