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Summary of Significant Accounting Policies - Revenue By Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Revenue	$ 601,117	$ 573,152	$ 490,907
Cloud communications
Revenue from External Customer [Line Items]
Revenue	478,892	474,576	449,656
Messaging surcharges
Revenue from External Customer [Line Items]
Revenue	$ 122,225	$ 98,576	$ 41,251

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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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