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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 107,723 | $ 69,453 | $ 74,305 | $ 91,477 | $ 105,683 | $ 95,374 | $ 119,333 | $ 122,185 | $ 342,958 | $ 442,575 | $ 410,561
Long-Lived Assets | 68,084 |  |  |  | 70,982 |  |  |  | 68,084 | 70,982 | 56,796
United States. |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 256,092 | 342,802 | 313,916
Long-Lived Assets | 67,336 |  |  |  | 70,022 |  |  |  | 67,336 | 70,022 | 56,089
Europe |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 28,743 | 29,417 | 26,936
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 58,123 | 70,356 | 69,709
Long-Lived Assets | $ 748 |  |  |  | $ 960 |  |  |  | 748 | 960 | 707
International | Revenue | Geographic concentration risk |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 306,600 | $ 388,300 | $ 348,500
Percentage of revenue |  |  |  |  |  |  |  |  | 89.40% | 87.70% | 84.90%

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