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Goodwill and Intangible Assets - Acquisition-Related Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Gross carrying amounts:    
Balance $ 9,523 $ 10,045
Foreign currency translation 83 (168)
Balance 9,606 9,877
Accumulated amortization:    
Balance 3,248 2,439
Amortization expense 725 745
Foreign currency translation 36 (50)
Balance 4,009 3,134
Developed technology [Member]    
Gross carrying amounts:    
Balance 2,999 3,204
Foreign currency translation 51 (63)
Balance 3,050 3,141
Accumulated amortization:    
Balance 1,137 902
Amortization expense 230 238
Foreign currency translation 24 (22)
Balance 1,391 1,118
Customer relationships [Member]    
Gross carrying amounts:    
Balance 2,081 2,264
Foreign currency translation 63 (53)
Balance 2,144 2,211
Accumulated amortization:    
Balance 766 645
Amortization expense 133 139
Foreign currency translation 24 (16)
Balance 923 768
Trademarks and trade names [Member]    
Gross carrying amounts:    
Balance 855 884
Foreign currency translation 4 (9)
Balance 859 875
Accumulated amortization:    
Balance 440 330
Amortization expense 90 91
Foreign currency translation 2 (3)
Balance 532 418
Patents [Member]    
Gross carrying amounts:    
Balance 42 46
Foreign currency translation 1 (1)
Balance 43 45
Accumulated amortization:    
Balance 19 15
Amortization expense 3 3
Foreign currency translation 1 1
Balance 23 19
Media Contact Database [Member]    
Gross carrying amounts:    
Balance 3,546 3,647
Foreign currency translation (36) (42)
Balance 3,510 3,605
Accumulated amortization:    
Balance 886 547
Amortization expense 269 274
Foreign currency translation (15) (10)
Balance $ 1,140 $ 811