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Segment Information (Schedule of Income (Loss) from Operations by Geographic Area) (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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations | $ (7,019) | $ (10,984) | $ (7,722) | $ (17,466) | $ (5,703) | $ (32,335) | $ (6,864) | $ (9,071) | $ 4,073 | $ (22,017) | $ (3,717) | $ (16,759) | $ (43,191) | $ (53,973) | $ (38,420)
Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | (69,081) | (79,429) | (64,377)
EMEA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 5,283 | 7,483 | 6,016
Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,607 | $ 17,973 | $ 19,941

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