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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, 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
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues | $ 26,898 | $ 25,505 | $ 28,184 | $ 30,825 | $ 27,062 | $ 25,301 | $ 28,075 | $ 30,884 | $ 111,412 | $ 111,322
Operating income (loss) | $ 855 | $ 1,214 | $ 2,424 | $ 4,971 | $ 2,789 | $ 714 | $ 1,078 | $ 3,657 | 9,464 | 8,238
Asia Pacific |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,490 | 7,859
Operating income (loss) |  |  |  |  |  |  |  |  | (7,488) | (6,322)
Asia Pacific | Operating Segments |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,402 | 7,869
Asia Pacific | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 88 | (10)
Europe |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,898 | 36,149
Operating income (loss) |  |  |  |  |  |  |  |  | 4,461 | 4,973
Europe | Operating Segments |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 39,556 | 36,468
Europe | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (2,658) | (319)
North America |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 68,024 | 67,314
Operating income (loss) |  |  |  |  |  |  |  |  | 12,491 | 9,587
North America | Operating Segments |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 65,454 | 66,985
North America | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 2,570 | $ 329

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