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Segment and Geographic Information - Reconciliation of Segment Profit (Loss) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) segment | Mar. 31, 2020 USD ($)
Segment Reporting [Abstract] |  |
Number of reportable segments | segment | 2 |
Segment Reporting Information [Line Items] |  |
Revenue | $ 113,479 | $ 68,518
Cost of revenue | 61,328 | 36,359
Gross profit | 52,151 | 32,159
CPaaS |  |
Segment Reporting Information [Line Items] |  |
Revenue | 100,146 | 59,121
Cost of revenue | 53,681 | 31,892
Gross profit | 46,465 | 27,229
Other |  |
Segment Reporting Information [Line Items] |  |
Revenue | 13,333 | 9,397
Cost of revenue | 7,647 | 4,467
Gross profit | $ 5,686 | $ 4,930

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