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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, 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
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 27,062 | $ 25,301 | $ 28,075 | $ 30,884 | $ 26,997 | $ 24,687 | $ 26,411 | $ 28,429 | $ 111,322 | $ 106,524 | $ 114,263
Operating income (loss) | $ 2,789 | $ 714 | $ 1,078 | $ 3,657 | $ 1,079 | $ 18 | $ 1,386 | $ 2,062 | 8,238 | 4,545 | 10,186
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 |  |  |  |  |  |  |  |  | 7,859 | 7,519 | 9,698
Operating income (loss) |  |  |  |  |  |  |  |  | (6,322) | (5,967) | (3,890)
Asia Pacific | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (10) | (34) | 73
Asia Pacific | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,869 | 7,553 | 9,625
Europe |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,149 | 33,681 | 36,907
Operating income (loss) |  |  |  |  |  |  |  |  | 4,973 | 2,290 | 5,604
Europe | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (319) | (353) | (595)
Europe | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,468 | 34,034 | 37,502
North America |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 67,314 | 65,324 | 67,658
Operating income (loss) |  |  |  |  |  |  |  |  | 9,587 | 8,222 | 8,472
North America | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 329 | 387 | 522
North America | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 66,985 | $ 64,937 | $ 67,136

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