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Segment and Geographic Information - Summary of Operations by Segment and Geographical Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment revenue: |  |  |  |
Revenue | $ 150,462 | $ 119,125 | $ 430,763 | $ 327,996
Segment income (loss) from operations: |  |  |  |
Total income from operations | 9,704 | 5,877 | 20,687 | 16,289
United States |  |  |  |
Segment revenue: |  |  |  |
Revenue | 141,637 | 114,677 | 407,050 | 316,108
Segment income (loss) from operations: |  |  |  |
Total income from operations | 19,956 | 14,456 | 51,456 | 40,384
International |  |  |  |
Segment revenue: |  |  |  |
Revenue | 8,825 | 4,448 | 23,713 | 11,888
Segment income (loss) from operations: |  |  |  |
Total income from operations | $ (10,252) | $ (8,579) | $ (30,769) | $ (24,095)

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