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Revenue Recognition - Deferred Revenue (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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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

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