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Goodwill and Intangible Assets - Acquisition-Related Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended 18 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Gross carrying amounts:      
Balance $ 9,805 $ 9,523 $ 9,523
Foreign currency translation (388) 228  
Balance 9,417 9,751 9,417
Accumulated amortization:      
Balance 4,329 3,248 3,248
Amortization expense 450 484  
Foreign currency translation (183) 91  
Balance 4,596 3,823 4,596
Developed technology [Member]      
Gross carrying amounts:      
Balance 3,108 2,999 2,999
Foreign currency translation (139) 99  
Balance 2,969 3,098 2,969
Accumulated amortization:      
Balance 1,493 1,137 1,137
Amortization expense 153 154  
Foreign currency translation (74) 44  
Balance 1,572 1,335 1,572
Customer relationships [Member]      
Gross carrying amounts:      
Balance 2,177 2,081 2,081
Foreign currency translation (111) 96  
Balance 2,066 2,177 2,066
Accumulated amortization:      
Balance 983 766 766
Amortization expense 88 90  
Foreign currency translation (52) 36  
Balance 1,019 892 1,019
Trademarks and trade names [Member]      
Gross carrying amounts:      
Balance 871 855 855
Foreign currency translation (22) 13  
Balance 849 868 849
Accumulated amortization:      
Balance 567 440 440
Amortization expense 27 60  
Foreign currency translation (11) 6  
Balance 583 506 583
Patents [Member]      
Gross carrying amounts:      
Balance 44 42 42
Foreign currency translation (2) 1  
Balance 42 43 42
Accumulated amortization:      
Balance 24 19 19
Amortization expense 2 1  
Foreign currency translation (1) 1  
Balance 25 21 25
Media Contact Database [Member]      
Gross carrying amounts:      
Balance 3,605 3,546 3,546
Foreign currency translation (114) 19  
Balance 3,491 3,565 3,491
Accumulated amortization:      
Balance 1,262 886 886
Amortization expense 180 179  
Foreign currency translation (45) 4  
Balance $ 1,397 $ 1,069 $ 1,397