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Segment and Geographic Information - Reconciliation of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets	$ 1,100,926		$ 1,100,926		$ 890,608
Revenue	130,638	$ 84,758	364,775	$ 230,066
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets	10,156		10,156		$ 11,249
CPaaS
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	107,376	73,762	312,561	199,959
CPaaS | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	94,135	71,809	275,986	194,414
CPaaS | International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	13,241	1,953	36,575	5,545
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	23,262	10,996	52,214	30,107
Other | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	20,924	10,584	46,776	29,127
Other | International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,338	$ 412	$ 5,438	$ 980

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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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