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Business Segment and Geographic Region Information - Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 105,683 | $ 95,374 | $ 119,333 | $ 122,185 | $ 116,396 | $ 104,482 | $ 102,790 | $ 86,893 | $ 442,575 | $ 410,561 | $ 266,980 | $ 266,980
Long-Lived Assets | 70,982 |  |  |  | 56,796 |  |  |  | 70,982 | 56,796 |  | 52,523
United States. |  |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 342,802 | 313,916 |  | 191,261
Long-Lived Assets | 66,089 |  |  |  | 56,089 |  |  |  | 66,089 | 56,089 |  | 52,006
Europe |  |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 29,417 | 26,936 |  | 25,436
Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 70,356 | 69,709 |  | 50,283
Long-Lived Assets | $ 4,893 |  |  |  | $ 707 |  |  |  | 4,893 | 707 |  | 517
International | Revenue | Geographic concentration risk |  |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 388,300 | $ 348,500 |  | $ 213,800
Percentage of revenue |  |  |  |  |  |  |  |  | 87.70% | 84.90% |  | 80.00%

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