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Segment and Geographic Information - Reconciliation of Segment Profit (Loss) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Revenue	$ 130,638	$ 84,758	$ 364,775	$ 230,066
Cost of revenue	72,395	45,527	199,782	123,895
Gross profit	58,243	39,231	164,993	106,171
CPaaS
Segment Reporting Information [Line Items]
Revenue	107,376	73,762	312,561	199,959
Cost of revenue	54,841	39,346	164,616	108,467
Gross profit	52,535	34,416	147,945	91,492
Other
Segment Reporting Information [Line Items]
Revenue	23,262	10,996	52,214	30,107
Cost of revenue	17,554	6,181	35,166	15,428
Gross profit	$ 5,708	$ 4,815	$ 17,048	$ 14,679

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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