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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Revenue by Geographic Area | Revenue by geographic area is based on the locations of our partners. The following table sets forth revenue by geographic area (in thousands):
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
United States |  | $ | 190,810 |  |  | $ | 39,147 |  |  | $ | 40,400 |
Europe |  |  | 116,901 |  |  |  | 126,289 |  |  |  | 190,384 |
Total revenue |  | $ | 307,711 |  |  | $ | 165,436 |  |  | $ | 230,784 |

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