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Segment and Geographic Information - Reconciliation of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets	$ 1,070,349		$ 890,608
Revenue	113,479	$ 68,518
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets	10,537		$ 11,249
CPaaS
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	100,146	59,121
CPaaS | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	88,862	57,398
CPaaS | International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	11,284	1,723
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	13,333	9,397
Other | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	11,936	9,125
Other | International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,397	$ 272

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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