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Revenue Recognition - Deferred Revenue (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Total deferred revenue - short term $ 107,671 $ 88,848
Total deferred revenue - long term 489 409
Hosted Services - Business    
Disaggregation of Revenue [Line Items]    
Total deferred revenue - short term 105,239 86,144
Hosted Services - Consumer    
Disaggregation of Revenue [Line Items]    
Total deferred revenue - short term 889 835
Professional Services    
Disaggregation of Revenue [Line Items]    
Total deferred revenue - short term 1,543 1,869
Total deferred revenue - long term $ 489 $ 409