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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 119,605	$ 91,603	$ 227,496	$ 169,691
Hosted Services - Business
Disaggregation of Revenue [Line Items]
Total revenue	95,092	72,382	178,732	133,435
Hosted Services - Consumer
Disaggregation of Revenue [Line Items]
Total revenue	9,810	7,587	18,821	13,826
Professional Services
Disaggregation of Revenue [Line Items]
Total revenue	$ 14,703	$ 11,634	$ 29,943	$ 22,430

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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