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Segment Reporting and Significant Customer Information - Operating Results from Continuing Operations and Assets by Business Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 26,997 | $ 24,687 | $ 26,411 | $ 28,429 | $ 26,814 | $ 26,823 | $ 29,798 | $ 30,828 | $ 106,524 | $ 114,263 | $ 123,961
Operating income (loss) | $ 1,079 | $ 18 | $ 1,386 | $ 2,062 | $ 2,028 | $ 1,875 | $ 3,437 | $ 2,846 | 4,545 | 10,186 | 3,820
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,519 | 9,698 | 10,649
Operating income (loss) |  |  |  |  |  |  |  |  | (5,967) | (3,890) | (2,469)
Asia Pacific | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (34) | 73 | (12)
Asia Pacific | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,553 | 9,625 | 10,661
Europe |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 33,681 | 36,907 | 39,736
Operating income (loss) |  |  |  |  |  |  |  |  | 2,290 | 5,604 | 2,472
Europe | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (353) | (595) | (131)
Europe | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 34,034 | 37,502 | 39,867
North America |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 65,324 | 67,658 | 73,576
Operating income (loss) |  |  |  |  |  |  |  |  | 8,222 | 8,472 | 3,817
North America | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 387 | 522 | 143
North America | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 64,937 | $ 67,136 | $ 73,433

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